Did you make any dietary changes at the same time you started this? Or is the workout the only thing you changed in the last 50 days. Just trying to attribute the weight loss to the right factors. I compared the first side photo to the 50 day side photo and only saw a slight gain in the peck area. You don't really look more toned in your arms or torso.

Now, you were already a slim guy. For the US audience he went from 152 lbs down to 149 lbs. Which really is within a daily fluctuation depending on time of day, full/empty bladder, full/empty pooper, hydration level... etc.

As I have 2 kids, a full time job, and other odds and ends that I do, I'm temped to give this a try just for the sheer time element. Have you every tried to do 2 sets of the intervals at a time? How exhausted do your muscles feel after this 7 minutes? Would a 2 minute recovery allow you to do it again?