Time under contraction is not directly measured in a typical weight training program. Most people really don't even think about the number of seconds a given muscle is forced to work. Indirectly, ...
Fitgurú on MSN
The secret to bigger, more defined arms: Why concentration curls are a game-changer for ...
If you want sculpted biceps with real definition, this focused move could be the missing link in your arm workout.
一些您可能无法访问的结果已被隐去。
显示无法访问的结果