One editor-approved favorite is the Chirp Wheel, and we’re clearly not the only fans — it was purchased over 600 times on Amazon last month alone! The Chirp Wheel Foam Roller comes in four sizes — ...

You may remember Chirp for its wheel-shaped foam roller, a hollow hunk of plastic outfitted in cushy rubber, designed to relieve pain from your low back up to your neck.

You can use a chirp wheel, yoga block ... To add movement to the 90-90, raise your back foot away from the mat and lower it again for 8-10 reps, then switch sides. Some people even find their ...