Every Sunday each client sends me their training log for the week. It takes about ten minutes to fill in and it is the most important part of the coaching.
What I look at
The weights, the reps, how hard each set felt on a scale of one to ten, and a line about sleep and stress. That is enough to see whether the plan is working.
What I change
If a lift moved easily, it goes up. If sleep was bad, the next week is lighter. The plan you get on Monday is always written for the week you are actually having.