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For a good hamstring stretch, lie on your back on the floor. Leave one leg extended on the floor and raise the other, knee straight, until you feel the stretch in your hamstring. Loop a towel around your leg and hold the ends in your hands to make it easier.
Again, remember to always warm up well before stretching!
This is basically yoga - good tip though.
In yoga this is part of a sequence called padagustasana. There are a number of things to watch to make sure you both perform it safely and get the maximum benefit. For instance, move with breath, notice the level and ground contact of your hips.
good hint, and so easy!