No, the opposite, if your hamstrings are tight then when you are trying to flex your hips you're also having to fight against your hamstrings at the same time.

No, the opposite, if your hamstrings are tight then when you are trying to flex your hips you're also having to fight against your hamstrings at the same time. Hamstring stretches are pretty well trodden, yoga or any kicking martial art will have a wealth of material for how to increase your hamstring flexibility.