Collocations for fitness - noun

full, peak
low
general, overall
individual, personal
aerobic, physical
cardiorespiratory, cardiovascular
mental
match (BrE)
Tomkins is back to match fitness and is expected to play in the final.

degree, level
You need a good level of physical fitness for this sport.

attain
He has attained peak fitness this season.

maintain
Regular exercise helps to maintain physical fitness.

be back to, get (sb) back to, regain, return to
build, build up, enhance, improve, increase, work on
A special trainer has been brought in to work on her fitness.

measure
prove
The coach has given him a week to prove his fitness.

level
First, determine your present fitness level.

training
plan, programme/program, regime, regimen (AmE), routine
class
equipment
video
assessment, check (BrE), test
goal
centre/center, club, facility
a fitness club with gym and squash courts

buff, enthusiast, fanatic, freak
She's a bit of a fitness freak. She goes running every night.

consultant, expert, guru
coach, instructor, trainer
industry
benefits
Skiing offers many fitness benefits.

health and fitness
Walking is good for health and fitness.