Tight hip flexors? Here’s the explanation you need! The hip flexor muscles, namely the psoas and iliacus, are responsible for that hip flexion, but when they’re tight, they can cause some back pain. But we’ve got the perfect exercises to train and strengthen them! Try the front split lift-off to train the hip flexors in a lengthened position and the Primal Hip Reapers for a more shortened position. Start with 2 sets of 6-8 reps for the first exercise and 2 sets of 4-6 reps for the second. Give t