I cannot do strong exertion chest exercises like pushups, chest presses, etc, but the upper body strength days in the workout program have a lot of these. I often just do plank shoulder taps or some such thing instead, but is there any suggested substitute? It's ok if my chest muscles are activated a bit (like they are in a plank) but I canNOT do exercises that really target the chest muscles.

any thoughts or suggestions on substitutes? thanks!!