Resting heart rate - see Heart rate, resting
Pull buoy - a foam flotation device designed to fit between your legs and keep the lower part of your body afloat without kicking. It allows you to work only your upper body and concentrate on your swimming stroke. Complementary to a kick board
Warmup - Opposite of cooldown. A gradual speeding up for a few minutes when you start an activity. Lets your body temperature, heart rate, blood pressure, and muscles prepare.
Burnout - When you've done too much exercise over time, or are bored. You don't feel like exercising. Also, see "overtraining."
Tendon - A flexible, non-elastic tissue that connects muscle to bone. Damaged in strains.
Digestion - the breakdown of food materials mechanically (through chewing) and chemically (by digestive enzymes) until it is in a form which can be absorbed from the gastrointestinal tract into the blood
Concentric contraction - A contraction where the muscle shortens, such as in a bicep curl. There is movement in the joint (here, elbow) so it is called a dynamic action.
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