Providing alternative exercises

Unfortunately gyms can get crowded at peak hours and you might not always be able to get on the equipment that you want. I think it would be great if the app could provide alternative exercises in a routine to give users other options for targeting a body part when gyms get crowded or machines are unavailable. This could even be drawn from the plethora of exercises that Dr. Muscle already has in the program and would be helpful for newbies who may not be aware of multiple exercises that target various body parts.