Let’s say your coach programs 10 reps for you:

Signs the weight is too light:

You complete all 10 reps and it felt pretty easy

You complete all 10 reps and it felt challenging, but you think you could have done a few more reps

Signs the weight is just right:

You complete all 10 reps and it felt very challenging. 

You complete all 10 reps and you could not have done any more. 

The first 5 reps felt good, the next few reps felt challenging and the last 2-3 reps were a major struggle that you had to really dig deep to get through. 

You complete all 10 reps and your form looks and feels good

You complete all 10 reps and you don’t experience any pain

Signs the weight is too heavy:

You are not able to make it through all 10 reps

You complete all 10 reps but your form was not right 

You complete all 10 reps but you felt pain