If you’re struggling with getting all the way down in those elusive front-splits, there are two areas of flexibility that you’ll want to pay special attention to: the hamstrings and the hip flexors. Spend some time working to increase your range of motion in each of these areas individually with the stretches in this article.
The iliopsoas is the only muscle (well, technically group of muscles) that attaches to the spine, pelvis, and femur (or, thigh). The three muscles which make up the iliopsoas are deep, running very near the spine and beneath other major muscle groups. Therefore, awareness of the iliopsoas must come through visualization.