athletic	stay fit	reduce stress
avoid stress	look fit	sedentary lifestyle
be a fitness fanatic	follow a sensible diet	slob
be a fitness freak	get enough sleep	stay in shape
be as fit as a fiddle	give up (smoking)	take up sport
couch potato	go jogging	take up exercise
cut down on fatty food	junk food	TV dinners
do (regular) exercise	fatty food	takeaways
fast food	(be) out of shape	ready meals
fit	put on weight	work out in the gym
keep fit	be overweight