It depends on client goals. As a general rule, I take:
-Waist to Hip Ratio
-Body Composition via Omron (bioelectrical impedance)
-Leg Press (Lower body strength)
-Pushups (upper body strength)
I also assess posture and shoulder/neck flexibility.
For functionality, I have clients perform specific exercises (squats, hip circles, pushups, plank) to look for muscular imbalances. I’m looking at pushups and plank not just for upper/core strength, but also to see where their hips and shoulders are, for example. Is there internal rotation of the shoulders (very common in the corporate world from long hours in front of the computer)? I make my recommendations as a trainer based on what I find, and what the client’s goals are.