I seriously have the same issue you do. It gets so bad I am unable to walk. I keep on top of it now by stretching as much as possible. You'd be surprised how much your back relaxes after your hamstrings are stretched out. If I don't keep on top of it, I am out for at least a week after my doc gives me enough injections to get the spasms to release.
Try this and see if you feel it.
1. Lie flat on your back on the floor.
2. Try to lift one leg so that it is perpendicular to the floor.
3. Did you do it? If not, put a towel under your hamstring, grab each end of the towel and lift your leg further. How does that feel? If you have what I have, you have very tight hamstrings.
Try this and see if you feel it.
1. Lie flat on your back on the floor.
2. Try to lift one leg so that it is perpendicular to the floor.
3. Did you do it? If not, put a towel under your hamstring, grab each end of the towel and lift your leg further. How does that feel? If you have what I have, you have very tight hamstrings.