So far I have come up with:
verbs: drills,work out, train
Nouns: Aerobics, Workout, Cardiovascular exercise
adjectives: workout, keep fit, bodybuilding
It is not targeted at a specific age group or level of learners which is what is making this excercise difficult and stops me from thinking of the best way to tackle it.
And thank you so much for your help!!! the idea about clothing and equipment does help.