Dumbell Lunges

[Brick_53]

When doing dumbell lunges, you knee isn't supposed to touch the ground right?

[FuzzzET]

you back knee is suppost to touch the ground yes...
shows that your are stretching far enough (that the leg your lunging with makes a 90 degree angle and your knee isn't pass your foot, but that its a long lunge, not too long of course, so you actually work your hamstring and muscles)

It can be done with dumbells or a straight bar if your skilled and can keep your balance...

[DBJohn24]

its actually best to stop right before your knee touches to ensure constant tension on the muscles.