I started this yesterday and have just had my second go at level 1. Very challenging (I haven't done fitness for a while...) but a really good workout.

I have problems with my wrist, though, so can't take my body weight for press-ups. I just substitute planks (taking my weight on my forearms) during the press-up sections - hope that works well enough!

I found day 2 harder than day 1 (still aching a bit) but it's enjoyable and quick :-)