I'm going to add my vote to this suggestion: Low Impact series please.
After all, which of us is getting any younger? Which of us has not had a brush with joint pain/injury as we age?
Included in this low impact series I would like to see a workout that takes its inspiration from physical therapy, building strong knees, strong and stable hips, strong glutes through all 3 gluteal muscles, not just the maximus. Use versaloops, resistance bands, light weights, BOSU and stability ball, and pay particular attention to balance work to strengthen the stabilizing muscles that help prevent injuries when we leap about to HiiT.
As we age, to keep us injury free and without muscle imbalances, so that we can keep on doing Cathe high impact workouts, we need this kind of workout in our weekly rotation. Please put this on the market, no-one else has yet. And for all those who have never rehabbed an injured joint in physiotherapy, do not be fooled: this kind of workout is tough and will make you sweat just as it makes you realize just how bad your sense of balance really is.
Thanks.
Clare