1) I thought the current science is that "knee extensions" and "leg curls" were considered to be particularly bad for you and highly prone to injury.
2) Did this go out of style and come back? I remember hearing about the benefits of "isometric overload" like this the whole way back in the late 1980s.
2) Did this go out of style and come back? I remember hearing about the benefits of "isometric overload" like this the whole way back in the late 1980s.