At the gym: essential English vocabulary

to decide what you want to achieve (поставить цель)

умею It's easier to stay motivated if you set a goal.

to stay healthy and physically strong (поддерживать себя в форме)

e.g. She swims twice a week to keep fit.

to exercise and eat healthily to improve your physical condition and lose weight (привести себя в форму)

e.g. I'm trying to get in shape before the summer.

to be fit and healthy ≠ to be unfit (быть в форме ≠ быть не в форме)

e.g. We are both in shape and visit gym regularly.
After months without exercise, I was out of shape.

to exercise using heavy weights to make your muscles stronger (заниматься с весами)

e.g. I lift weights three times a week at the gym.

to become less heavy, thinner and lighter (похудеть / сбросить лишние килограммы)

e.g. She wants to lose weight before her holiday.
He started running to shed a few pounds.
Doctors have told Benny to slim down.

to gain muscle and become bigger and stronger (набрать мышечную массу)

e.g. Will Smith bulked up his body to play the part of Mohammad Ali.

to make your muscles firmer, not bigger (подтянуть тело, привести тело в тонус, сделать более рельефным)

e.g. Pilates is a great way to tone up.

feel a painful hot feeling in your muscles because they are working hard (чувствовать жжение в мышцах)

e.g. I could really feel the burn after doing squats.

to join a class, course, gym or activity by registering (записаться)

e.g. I signed up for a gym membership.
She signed up for a yoga class.