Frog Slides

This is a good way to find problems before they get serious. You start by getting into the wide-legged child pose:

A lot of runners have tight shins and this will definitely let you know if you do. You then move forward into the frog pose, which will take swinging your legs at the knee; it's best to learn the pose and then figure out how to move between them.

Almost no runners can get their hips down to the floor. You can feel this in the quads, in the hips or in other places, depending on where you're most tight. Staying on your forearms makes it easier. Moving back and forth between these poses, you can usually improve how far you can drop your hips in the frog pose.