
For some people arching the back during an exercise cause no problem and for others, it's dangerous. Let's see 😎
Jun 4, 2018
1 min

When I was 16 years old, I had trouble to gain muscles and I disappointed with the results. I gave up. Several years later, I do my homework to learn how to gain clean muscle and this is what I found.
Jun 4, 2018
17 min