I can spot the obvious stuff now, like a knee caving in or a shoulder that won't lift right. But the small tricks a body plays to hide a weak spot still slip right past me. A more seasoned trainer will glance at the same person and see three things I completely missed.
More people experience this than they realize.
You can read the obvious problems but miss the hidden ones.
If this sounds familiar, the Library can help you find the bigger picture.