When it is very hot outside, your heart has to work extremely hard just to keep you from overheating. Because of the increased amount of metabolic heat and sweating, your blood actually becomes thicker, which slows down the delivery of oxygen your muscles need to repair themselves. Your body essentially hits "pause" on regenerating damaged joints and muscles while it is working to maintain your internal body temperature. If you don't reduce the intensity of your activity in the heat, you can risk setting off a system-wide pro-inflammatory response. Your heart is already working quite hard to cool you down and support your muscles. If you have existing joint problems, the increased systemic inflammatory response of high intensity exercise in the heat will further irritate the pain and stiffness associated with the original joint injury. Learn to work with the body's cooling system and not against it. Low-intensity exercises such as a walk or an easy bike ride, still increases circulation and lymphatic flow to the joints and helps with the repair process without pushing the body into thermal danger or dehydration. Not to say that you should be sedentary just because it's 100 degrees outside; motion is essential for managing osteoarthritis. Without motion, joints tighten up, you gain weight (which puts even more stress on the knees and hips!) and you lose the ability to move independently. Just don't go for a hard run in the heat. Instead, walk at the mall or a gym where there is air conditioning. For exercise, I suggest recumbent cycling at low resistance and resistance band exercises in a seated position. These exercises will keep the blood flowing and the muscles moving, without putting your body in distress.
I see it every summer. The heat makes your heart pump harder and slows down muscle recovery, often leaving clients swollen and exhausted by noon. If your joints bother you, dialing back the intensity actually helps. It gives your body a chance to cool down and repair itself without the extra stress. I usually suggest water aerobics, resistance bands, or a simple morning stretch to keep you moving without overheating. If you have any questions, feel free to reach out to my personal email
Higher temperatures put a strain on the cardiovascular system because hotter temperatures lead to the heart working more to bring more blood flow to the skin required for cooling down the body. This elevates the heart rate, oxygen demand, and also leads to dehydration due to sweating, which leads to a reduction of volume in the blood, which further strains the heart and blood vessels (https://pubmed.ncbi.nlm.nih.gov/34419205/). Due to the strain that hotter temperatures can have on the body, people exercising in hotter temperatures should reduce the intensity of their exercises so that the strain on the cardiovascular system will be less. Studies have shown that low-intensity movement leads to a reduction in the body's inflammation due to a decrease in pro-inflammatory cytokines and an increase in anti-inflammatory myokines which help protect the body against damage (https://pubmed.ncbi.nlm.nih.gov/21818123/). Current research indicates that exercise is really the first-line therapy for osteoarthritis because it frequently reduces pain, improves quality of life and enhances physical function (https://pmc.ncbi.nlm.nih.gov/articles/PMC10518852/). Some exercises that help joint health and are also heat-appropriate include activities like walking, tai chi, swimming and balance training. Aleksey Aronov Founder AGPCNP-BC Adult Geriatric Primary Care Nurse Practitioner - Board Certified VIPs IV https://vipsiv.com New York, NY
Heat increases strain on the body during exercise. The heart works harder to circulate blood while the body cools itself through sweating. Fluid loss increases, which raises hydration needs and can slow recovery if intensity is too high. For this reason, exercise intensity should be reduced in hot weather. Slower pacing, shorter sessions, and hydration breaks help the body manage both movement and temperature control. Low-intensity movement works well in these conditions. Gentle activity improves circulation, helps move synovial fluid through the joints, and supports tissue repair without adding unnecessary inflammatory stress. Even during summer heat, exercise remains one of the most effective ways to manage joint pain and osteoarthritis. Regular movement strengthens the muscles that support joints and helps maintain range of motion. Joint-friendly options include: Walking at a comfortable pace in cooler parts of the day Swimming or pool walking Light stationary cycling Gentle stretching or mobility work Resistance band exercises to support joint stability
In warmer weather I recommend favoring short, low-intensity movement and isometric holds rather than prolonged exertion, using small segments of activity to keep joints moving without overdoing it. Adjusting intensity downward makes those brief sessions sustainable and easier to manage in heat. Low-intensity movement like ankle circles, wrist bends, leg lifts and isometric contractions works with the body’s recovery by keeping circulation and mobility active without adding heavy load. Exercise remains a first-line approach for joint pain because consistent daily movement combats the ill effects of a sedentary lifestyle and preserves function. Practical, heat-appropriate options I recommend are seated leg lifts, gentle squats done slowly or isometrically, ankle circles, wrist bends and short holds of muscle contractions.
Higher temperatures raise cardiovascular strain as your body has to work hard to not only move, but to cool you down as well. This increased work on the body leads to increased stress and increased hydration needs, and can slow muscle repair and recovery. People with inflammatory joint issues like osteoarthritis should be mindful of volume and recovery as the body has to work extra hard to calm things down in summer as it is doing so many other things to bring your body back to equilibrium. Exercise intensity should be more closely monitored in warmer conditions to limit systemic strain and inflammation. Since the body can be more easily strained we may need to more frequently take pressure off painful joints after activity so nerves and tissues calm. Low-intensity movement supports cooling and repair by promoting gentle circulation and mobility without overloading tissues, offering benefits without adding an inflammatory load. Exercise remains a top first-line therapy because improving mobility, correcting imbalances, and moving more reduces joint stress and inflammation as well as preserves overall cardiovascular health. We have helped countless people maintain and active lifestyle with slight modifications when the heat rises. Heat-appropriate options I recommend are gentle mobility routines, corrective low-load strengthening that avoids heavy joint compression, low-impact movement like yoga, swimming, biking, or the elliptical scheduled for cooler parts of the day or done in shaded or climate-controlled settings.
As Managing Director of Electric Wheelchairs USA, I am in conversation every day with OA patients who have become completely non-mobile in the summer, and are in an even poorer state by the fall. What most people overlook is that heat does not create new joint issues, but rather reveals existing deficiencies in movement. Cartilage is avascular (has no blood flow) and relies solely on the mechanical compression and decompression associated with movement to receive its nutrients. The demand for lower-intensity activity, as opposed to complete cessation of movement, should be present during the summer months. Examples of how seated water-resistance exercise; low-impact walking prior to 8 a.m.; and supine (lying-down) cycling can provide this necessary nutrient delivery without inducing an inflammatory response include:
The physiotherapist and hydrotherapist at EnableU provide hydrotherapy and/or physiotherapy services for NDIS participants and aged care residents throughout the year who are experiencing osteoarthritis. The majority of experts overlook the fact that the only form of exercise that addresses all three of the summer challenges (joint compression, maintaining a safe body temperature and circulating synovial fluid) is warm-water hydrotherapy. Studies confirm that the application of a water-based exercise program can reduce the pain associated with OA by as much as 40% . Therefore, the pool isn't a compromise it's the most accurate clinical prescription for summer activity available.
In my coaching I explain that higher summer temperatures increase cardiovascular strain and fluid loss and can slow muscle repair and recovery if hydration and effort are not adjusted. For that reason I recommend lowering exercise intensity during warm conditions so the body can prioritize cooling and healing rather than adding heat stress. Low-intensity movement like gentle yoga, light weight-bearing balance work, or free-form dance works with the body’s cooling and repair systems by promoting circulation and mobility without adding inflammatory load when practiced mindfully. Because these forms of movement preserve joint mobility and build supportive strength around the joint, exercise remains one of the most effective first-line therapies for joint pain and osteoarthritis in my practice. I commonly recommend gentle yoga, targeted weight-bearing balance exercises, and free, joyful dancing as heat-appropriate, joint-friendly ways to support mobility, circulation, and recovery.
Senior Consultant Cardiologist at Harley Street Heart & Vascular Centre
Answered a month ago
You should reduce exercise intensity in warmer conditions because heat increases cardiovascular strain and makes strenuous effort riskier. I routinely encourage moderate-intensity activity to lower long-term heart disease risk rather than pushing to maximal exertion. Strenuous exercise can unmask silent cardiac abnormalities and has been linked to rare but serious events, so avoiding high-intensity work in the heat is prudent. Choose shorter, lower-intensity sessions and stop if you experience chest pain, dizziness, or unusual breathlessness.
I've been training clients with joint issues for 16+ years, specializing in rehab/prehab and movement quality. A few things I see consistently with OA clients in summer: Heat drives up cardiovascular demand at lower intensities. Your heart is cooling you and fuelling movement simultaneously. A hot day doesn't mean an off day. Workout but dial back effort, usually 15-20% less volume is sufficient. The bigger issue is people stopping movement altogether when it gets hot. Cartilage feeds off movement; it has no direct blood supply, so circulation through synovial fluid is the whole game. I lean heavily on floor-based. Exercises like pelvic tilts, dead bugs, glute bridges, and hip 90/90s. Zero compressive load, no heat buildup from standing effort, and you're hitting the posterior chain and core-to-hip connection that supports most arthritic joints. I also use hip CARs almost daily with these clients, slow, end-range circles that maintain joint mobility without adding inflammatory load. Rob Moal | Personal Trainer Can-Fit Pro | FMS | CAFS trainlikerob.net | 604-704-9552
You're asking how summer heat changes exercise demands and why gentler movement matters more, especially with joint issues like osteoarthritis. From years of working long, physical days in hot Georgia summers, I've learned that higher temperatures push your heart rate up faster, increase fluid loss, and slow muscle recovery because your body is busy cooling itself instead of repairing tissue. That's why intensity needs to come down—what feels moderate in cool weather can become excessive strain in the heat, leading to more inflammation and fatigue rather than progress. I've found low-intensity movement—like steady walking or light mobility work—actually works with your body, keeping blood flowing for joint lubrication and nutrient delivery without overloading your system. One customer of mine with knee pain started doing short, early-morning walks and gentle stretching instead of midday workouts, and within weeks he noticed less stiffness and better recovery simply because he wasn't fighting the heat. Exercise still matters because it keeps joints moving, maintains muscle support, and reduces pain over time, even if the pace is slower. In hotter months, I recommend heat-friendly options like early morning or evening walks, pool-based exercises, stationary cycling at an easy pace, and simple range-of-motion drills. These keep circulation up and joints mobile without adding unnecessary stress, which is exactly what your body needs to stay functional and pain-managed.
At Superpower, I see how summer heat really hits people. Our data shows heart rates spiking faster on the same walks when it's hot out. You have to ease up. Pushing too hard will mess with your recovery and aggravate your joints. Simple things like walking in a pool or short strolls under a tree seem to keep blood moving without making your joints angry. If you have any questions, feel free to reach out to my personal email
1. In warmer conditions, the body will have to work harder to maintain internal temperature, and this will cause more cardiovascular stress as the heart will have to pump more blood to the surface to cool down. It will ultimately cause fatigue and more fluids to be lost due to sweating, thereby increasing demand for fluid consumption. Since fluids and electrolytes are required for muscle repair, dehydration can cause slower muscle repair and recovery for people with joint problems. 2. The intensity of exercise should be lowered in hot weather, as the body is already subjected to heat stress while trying to maintain an optimal core temperature. In addition, warmer temperatures can cause the body to overheat, which can lead to dehydration and heart strain. In the case of osteoarthritis or chronic pain, overexertion can cause pain. So lower exercise intensity allows the benefits to be maintained while reducing the strain on both the joints and the heart. 3. Low-intensity movement enables the body to stay active without increasing the core temperature or putting pressure on the cardiovascular system. It helps in improving circulation, which in turn aids in providing oxygen and nutrients to the areas that need repair. It also helps in moving synovial fluids in the joints to reduce stiffness without putting pressure on the inflamed areas. In hot weather, this type of movement can be more in sync with the natural cooling process. 4. Regular exercise helps to ensure that the joints remain mobile, the muscles supporting the joint remain strong, and the circulation is good. It helps to reduce the stiffness, which in turn helps to reduce the pain felt by those suffering from osteoarthritis. Exercise plays a crucial role to manage weight, which in turn helps to reduce the stress felt by weight-bearing joints such as the knee and hip. Even in warmer weather, exercise is an important component in the management of joint health. 5. In hot weather, some exercises that I recommend include walking at cooler times of the day, stretching, and range-of-motion exercises that do not put too much stress on the joints. Swimming or water aerobics are great exercises in hot weather because they provide support for the joints while at the same time helping to control body temperature. Yoga and tai chi improve balance, flexibility, and circulation while minimizing stress on the joints. They encourage movement while respecting the body's limitations in hot weather.