These work by instantly converting barbells, dumbbells and pull-up bars into thick bars so that you can train the way many Pro athletes do. Using a thicker diameter bar causes much greater muscle activation throughout the arms because it forces them to work much harder.

• Using a thicker diameter bar causes much greater muscle activation throughout the arms because it forces them to work much harder
• This increased muscle activation leads to bigger, faster gains in muscle size and functional strength (especially in overall arm size)

Specifications

Common questions