Slightly drifty - but it's better not to shorten your hip while stretching your hamstrings. Cyclists are especially prone to shortened hip flexors because of our riding position.

linky

Here's the stretch Bookspan recommends, although honestly I don't like that one for the simple reason of traction. I don't want to mark up my walls with shoes or bare feet, and if I'm wearing socks, my foot just slides down. I do prefer to stretch with one foot propped up on the back of a couch, or a stair rail or fence, still making sure both toes are pointed straight ahead and my spine is in neutral.