That's cool Jayhova.
I would however say that doign sprints is more time efficient, at only 15mins per session. Im not sure where you got 30 ins of sprinting. Due to the higher intensity, one need not go anywhere near this long.Again, I only sprint 2x per week.
Anyways, please have a read of the article, as I would strongly argue that sprinting is the most efficient way of doing cardio,losing fat and maitaining or even to spport muscular growth, especially the legs.
However, reading one thing, real world results are another. Having clients, why not try it out with a couple of clients? Just a suggestion. I mean in my case and others I know, we have been on both sides of the fence and have compared the results, and sprints have been far superior. You occasionally do sprints, but have never done them exclusively. I suggest you or one of your clients exclusively do interval training/sprints so you can compare the results. I can see you may be hesitant to do this given this is not what you're used to, but once you see the results and the time it saves, you may build them into your arsenal.
