Long time steooer here (think Jane Fonda and the 80's) and have an idea - how about a Challenge at a slower pace of 120-126 bpm for seniors? As in the 65 Summit Challenge yet paced fast enough for a good cardio? Love your workouts but some are a tad fast for me now. I can't be the only senior out there who doesn't want to give up stepping due to too fast a pace...am I? And yes, I have tried adjusting the speed but then it is waaaaayyyy  too slow at 75x.  Have a wondrous day!