I've been focussing hard on a good, tight arch in my back during squats. It feels good, and my form is tight. The arch is stopping me right at parralel, so I don't have to think about it. But I'm having a small issue I was curious about. I'm having some dull aches in the front of my hips, around the hip flexor. It feels like a combination of the joint, connective tissue, and muscle. Nothing specific, and no shooting pains. It sort of feels like someone punched me in the hip flexors for 15 minutes. This morning I did squats again and I definitely felt it at the bottom.