That is correct. Also, to strengthen the abs. It's interesting, but as Toddday was alluding to some time ago, some APT is good, because when you run/jump, the squeeze you get from the glutes will actually put you into neutral pelvic tilt, which is optimal. If you were in neutral pelvic tilt from the get go, the glute squeeze would've put you into posterior pelvic tilt, which would be sub-optimal.