During classes, I often advise “never hesitate to modify." This is an important consideration during your workout. Do not consider modifications as a sign of weakness - all it means is that this approach is your appropriate level for today.
It's about making the smart and most productive choices, focused on modifying and building your strength one class at a time, while not compromising your form.
However, don’t get too comfortable! When classes grow in intensity, and you question whether to modify or keep on going - the latter is your answer. Modify when your form suffers - not just because the workout is difficult. Don’t look for excuses!
And remember, change never comes from comfort zone. Challenge yourself, each and every time!