I use rubber bands from JUMP STRETCH to add resistance to my push ups.
Fold a towel and put it behind your neck. Then stretch the band to arms length
in front of you over the towel, while getting into a push up position.
Then commence to pushing up. I prefer feet elevated push ups.
There are several type of rubber bands with different degrees of tension.
You can also double up on the bands. Even surgical tubing will work.
Another method is the adding a solid resistance. Training partners
of various body weights works well. Here I'm doing simple push ups
with my one of my protégés, 123 lb Olympic & Power Lifter,
A SIMPLE WORKOUT FOR THE ABOVE EXERCISE!!!
First set: 25 reps minimum in the strictest style.
Second set: Add a human resistance, preferably
someone prettier than Robbie, then do 5 to 10 reps.
Final sets: Add someone 25 to 50 lbs heavier,
than the first human resistance, and do
3 to 5 reps for an additional 3 to 5 sets.