muscles (noun)

sore (adj)

strict (adj)

push-ups / press-ups (noun)

sit-ups (noun)

discipline (noun)

fit (adj)

mind (noun)

keep (something) quiet (phrase)

tough (adj)

warm up (noun & verb)

serious (adj)

take up (something) (verb)

defend (verb)

The body tissue in that gives us strength and power.

About a part of one's body that is painful or aching.

Strongly making someone follow rules about behavior.

An exercise in which a person lies on the floor, raises their body (with their back straight) by pressing down on their hands.

A physical exercise to make the stomach muscles stronger, in which a person sits up from lying on his/her back.

Being able to control yourself to follow rules and correct ways of behaving.

In good health, especially because of regular exercise.

The part of a person that makes think about the world and their experiences, and to feel emotions.

Never tell something (e.g. a secret) that someone told you to anyone else.

Difficult and needing a lot of effort.

Exercises or physical activity to get ready for sport or other physical activities.

Being very careful and responsible when doing something.

Start a new activity, hobby, sport, etc.

Try to stop someone attacking you (or someone else).