Differbetween
Muscles
difference between antagonist and protagonist muscles
The agonist is a muscle that contracts to cause the movement. The antagonist is an opposing muscle that relaxes relatively to stretch. These two roles...
who invented sit-ups
In the article he wrote on abs, Rippetoe said Joe Wider invented them in 1980.Why are sit ups bad?Who invented curl ups?Who invented crunches?Why are ...