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acid alcohol amount anabolic steroids arms aspirin athletes barbell beats a minute bicycle bicycle touring blister blood vessels bloodstream body temperature boots breathe calf muscles calories cause cells cold weather contract cross-country skiing develop diuretics doctor drink endurance exercise program exercise vigorously extra faster feel feet fluid foot force hamstring hamstring muscles hard heal heart attack heart rate heartbeat heat heel high blood pressure hurt increase injury isometric exercises jogging keep knee lift lower back lower leg lungs marathon miles oxygen pain pedal percent perspiration physician plantar fascia plantar fasciitis potassium prevent pulse rate pump blood quadricep muscles race regular exercise ride runner's knee runners running shoes skates skiing skin slowly sport stomach stop exercising strength training strengthen your heart stress stretch stronger sugar swimming tendons tennis elbow tired toes upper leg usually walking warm wear week weight workout