Something not working?
Hurting?
Anything getting overly sore?
One muscle group stronger than the other?
Maybe it's to a good
Let's-see-what-we-can-do
Extent
User error
Motion not good?
Range of motion limited?
Weakness somewhere along the chain?
Anything off-axis?
Or
Of course
Over-favoring
One side?
How about taking a look
At ourselves
Compare to others
And/or ask someone else
Once we see
Find ways to address
Try a few
See again