I posted this elsewhere (on fitness subreddit and it got deleted for retarded reasons)

To make it simple, in the plan that I follow, it's recommended that I do 3 sets of push-ups, 10 reps each. But I simply can't do 10 reps because of some medical condition (that started getting worse, apparently). I can do 5 reps however. So here's my question. Can I do 5 reps and do 6 sets instead? How much should be my maximum rest between sets? Thank you!