Especially avoid the leg extension machine since as a mixed - martial artist , you 've probably already got some minor knee issues from grappling .
You want to avoid anything that stresses your knee ligaments , such as the leg extension machine .
Especially avoid the leg extension machine since as a mixed - martial artist , you 've probably already got some minor knee issues from grappling , so you want to avoid anything that stresses your knee ligaments , such as the leg extension machine .