Hi, I'm a 5'11 guys weighing about 155 pounds and below are my results from doing strictly push ups at home. I don't have gym access and just work out from home without weights.
My routine is 3 x 50 pushups with 5 min break in between each set every other day, i.e. Monday, Wednesday and Friday and rest on weekend. It takes me about 15 mins a day.
My goal is to keep myself fit and lean because I play basketball as cardio exercise.
Below is my picture: