Recently I've been browsing on Elitefts and Rogue fitness for a prowler and I'm wondering for those who had done conditioning with a prowler can help me for a bit. How is it compare to hill sprints? Can you substitute hill sprints by doing prowler push? And finally, how much of your core comes into a play when pushing the prowler using the low bar, or do you feel it more in the quads? Thank you.