While technically not a true push-up, this exercise will get the job done – and make you "strong like gorilla." Wall push-ups are much easier than floor push-ups, so you might actually enjoy doing them!
Step 1: Stand and face the wall with your feet shoulder-width apart about a foot away from the wall.
Step 2: Rest your palms on the wall at shoulder height.
Step 3: Bend your elbows and lean toward the wall as far as possible.
Step 4: Keep your legs and back straight.
Step 5: Push yourself back to the starting position.
Step 6: Repeat ten times (or more if you'd like).
See the complete library of Workplace Fitness exercises.