How to Do the Thomas Test Lie face up on the edge of a bed or table so your legs hang off at 90-degree angles. From there, bring both knees toward your chest—keep your back still and flat—then ...

The test looks at the iliopsoas — the group of muscles that connect the spine to your legs, or the primary hip flexor muscle. Here’s how to do the Thomas test: ...

The hip flexors are necessary for comfortable living and strong cycling. Use the Thomas Test to assess their flexibility.

Use This Test to See if You Have Tight Hip Flexors How to Do the Thomas Test Lie face up on the edge of a bed or table so your legs hang off at 90-degree angles.