06/15/2026
Your psoas gets all the attention. It’s the muscle everyone blames for tight hips, lower back pain, and that deep ache you can’t quite stretch out. So you foam roll, you stretch, you hang on a pull-up bar… and somehow it never fully lets go. There’s a reason for that.
Meet the iliacus. It’s the psoas’s partner, tucked along the inside of your hip bone, and together they form your iliopsoas, the muscle group that flexes your hip every single time you sit, stand, walk, or climb stairs. The problem? Most people never release the iliacus. Stretching can’t reach it, and foam rollers glide right past it. So the tension just stays.
That’s the missing piece. When you only work the psoas and ignore the iliacus, you’re treating half the problem. The two muscles work as a unit, which means real relief only comes when you release both. Once you do, people describe it as their hips finally “unlocking” after years of feeling stuck.
That’s exactly what Thrival is built for: targeted release for both the psoas and the iliacus, so you stop chasing the pain and actually get rid of it. 🎯