Jams are you collapsing in a heap because of muscle failure or due to not being able to remain stable on the ball. If it is a stability issue, try slideboard leg curls or slideboard reverse lunges. If you don't have access to a slideboard or valslides, you can use paper plates or a towel under your feet as long as you have a hard surface floor that allows a decent amount of slide.
Both are great for your hamstrings.

Once those are easy, you will be ready to try glute-ham raises or natural glute ham raises.

Thanks for the suggestions for exercises. So, should I focus more of my leg time on ham/glute exercises for a while, maybe lay off the quad-dominant exercises, to try and balance things out a bit?

LG, isn't a Good Morning the same as a SLDL, except for barbell position? I'll try it, just curious if I'm thinking of the correct movement.

I did not get in my leg workout today. Just had company that I wasn't expecting this evening, and as soon as one left, another arrived, no kidding, about 3 minutes later, and didn't leave until a few minutes ago. Will probably do something about that tomorrow, but keep it light, since I've got skating in the evening.

You definitely can and should focus more of your leg time on the glutes/hams if you've identified an imbalance. I would do a 2:1 ratio until you achieve balance, though, rather than totally eliminating a movement pattern.

Good Morning everyone :coffee:

Yesterday was another early morning workout. I enjoy being one of the early birds in the gym but wow, it really hits me in the later part of the day. Its great to know that I can actually get up this early to avoid a nonworkout day. Last year there were times in which I needed to be available in the mid morning and my workouts were skipped. Hopefully this experience this summer will prevent this from happening again this school year.

Last night was the second last evening of our yoga class series. Can I just say that if my hamstrings and glutes did not hurt before they sure do today. I'm certain that I pulled something somewhere so I am laying off my "home practice" until this feels a little better. I may do a little biking today just to get some cardio in and quad work but no real hamstrings today. I think the wheels need a rest today. (smile)

:chin: Cheryl, if you want some serious hamstring strengthening think about a few yoga poses. If you haven't already done these check out a dvd and see if this gives you some more options. I really think that going deep in the warrior, http://www.yogajournal.com/poses/1708 http://www.yogajournal.com/poses/495 and triangle, http://www.yogajournal.com/poses/494 poses is what did me in. Be careful.