Barbell - a long bar with weights attached to each end. Requires both hands to pick up
Endorphins - a group of proteins produced naturally by the body with potent analgesic properties (similar to morphine). These are the brain chemicals that contribute to the "runner's high" or good feelings during and after exercise
Glycogen - Energy stores in your muscles stoked by carbohydrates in your diet. Hitting the wall means you're empty.
Hypertension - blood pressure above the normal range
Heart rate, target zones - Your THR may encompass a large range, but for different performance goals, you may focus on narrower zones within your target spectrum.
Dumbbell - a short bar with weights on each end that can be held in one hand
Perceived exertion - A fancy way to say "how do you feel," i.e. how do you "perceive" your "effort?" Often measured on a 0-10 scale, with 0 being nothing and 10 being all-out activity.
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