periodization: A method of organizing a strength training workout program into several periods, each lasting about four weeks. Each phase has a different emphasis.

Pilates: A form of exercise that emphasizes correct form using your body’s core. Pilates is named after its inventor, Joseph Pilates, who invented the technique for injured dancers.

plantar fasciitis: An inflammation of the tough fibrous band of tissue that runs the length of the bottom of your foot.

pulse: The number of times your heart beats per minute.