So I've recently been focusing on squats and deadlifts and have noticed accumulating soreness and tightness in my hip flexors.
i asked a PT student today and they recommended a great stretch i thought i'd share with the other squatters on this forum.
lie face-up on a table with your legs dangling and your butt half off. bend one leg at the knee and bring it up to your chest while maintaining the droop in your other leg. ideally you would have one person pushing your bent leg up while gently pulling your other leg down. you'll feel a great stretch in your dangling leg.
it's freagin money and much better than the other exaggerated lunge type stretches i've seen on the internet.