Crunches by age: Here's how many you should be able to do
A fitness trainer shared how many crunches people should be able to do according to their age. Here's what to know about the ...
Mens Fitness on MSN17h
Trainer Warns Men: Too Many Crunches Can Cause Back Injury
Have a friend who brags about being able to do a thousand crunches every day? Don't waste any energy on envy. "If your goal ...