Name the problem first
Suppose a session regularly runs past the time you have available. You could replace the programme, reduce the exercise list, visit a different gym, or start earlier. These are different solutions to different possible causes. First establish where the time is going.
If the delay is a queue for one machine, changing every exercise may be unnecessary. If the programme itself exceeds your available hour, arriving five minutes earlier will not resolve the mismatch. Write the problem in a sentence before adjusting the plan.
Then choose a change that addresses that sentence. Keep a dated note of what changed and why. Without that note, it is easy to remember only that the newer version felt different.
For a scheduling example, imagine that the journey from work is the problem. Trying the same session on a day when you leave from home gives you a clearer comparison than changing the gym, the session and the departure time together. Write down whether you arrived with enough time; that is the outcome this particular change was meant to improve.
Give the comparison a chance
One session is a noisy comparison. A different crowd, a late lunch break or a poor night can affect how the day unfolds. Use more than one ordinary visit where possible before deciding whether an administrative change helped.
This does not mean persisting with pain, unsafe equipment or an unsuitable exercise to complete an experiment. Those concerns call for appropriate help, not a longer trial. The one-change approach is useful for routine planning decisions; it is not a reason to ignore an immediate problem.
Keep unrelated ambitions out of the same revision. If you are testing a shorter session, simultaneously adding several new exercises defeats the purpose. Save other ideas in a separate note.
A successful adjustment should make the original problem smaller. Did you finish on time? Was the replacement station available? Could you understand the revised instructions without stopping to search for a video?
If the answer is no, restore the old arrangement or try a different clearly described change. You have still learned something about the constraint. This small record of decisions can be more useful than repeatedly declaring that you need a completely new routine.