Did you cringe when Cathe added the risers and grabbed that 15lber?
I'm such a wimp: I added only one riser to each side (for a total of 3) and used a 12 lb dumbbell instead. I did X77 last night and I just knew I was in trouble when I was tired after this one section...
I'm working my way up to X77. I've tried most alone and did 2 of the premixes, double low impact and X34. That one winded me, but I also didn't do all the shoulder presses, so I used heavier weights. I haven't tried the step one yet, that's next.
I think the Step segment might be the most difficult of all the X10s.