Touch the Toes
Stand with your feet directly under your hips.  Relax, straighten your back and knees, and bend forward, dropping your hands down to your toes.  Stay there for a count of ten.  Make sure your knees are straight - many people tend to let them bend - and let gravity do the work.  A flat back is critical, as mentioned above.  Slowly straighten up by uncurling your body, allowing your knees to bend and you back to uncurl one vertebrae at a time until you are standing upright.  Then repeat the stretch, this time pulling yourself as far down as you can go, either by grasping your ankles  or by placing your palms on the floor behind you feet and pulling downwards.
Various Stretches

Touch the Toes
Back Arch
Standing Groin Stretch
Hip Stretch
Hip and Hamstring
Groin Stretch
Groin Hamstring, and Hip Stretch / Straddle Split
Front Splits
Butterfly Stretch
Single Hamstring Stretch
Hurdle Stretch
Gluteus Stretch
Double Hamstring Stretch
Double Hamstring / Calf Stretch
Final Hamstring / Groin Stretch
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