Thank you so much for asking us, Cathe!
Another vote for STS 2.0/LMR sort of re-visit, with a bit more cardio added in. I see lots of asks for Kickboxing workouts, but I'd actually like another fun, well-choreographed step workout, too, like Step Moves, Party Rockin Step, or Step Boss. Steady-state cardio, please (just not a fan of HiiT). Or if including cardio provide maybe three with varying levels of intensity. Maybe a super intense HiiT workout, a steady-state step workout, and then a "lighter" kickboxing workout with options to up the intensity.
RE strength training, would love to see another "To The Mat" focused lower body workout. For the rest, I agree a segment of full body, upper body, lower body, and then parts workouts with the same strength and hypertrophy focus as STS 2.0. I don't know if it would be feasible, but actually parts workouts for lower body, too - like how you did a focus on quads/outer thighs in Lean Legs & Abs, and then hamstrings/glutes in Great Glutes.
I also like the suggestion of a metabolic workout, too. I really do enjoy Super Cuts and Metabolic Blast. I'm good with lighter weights, though curious how you'd approach such workouts with heavier weights as suggested by Nick, earlier. I suppose so long as the pace is slow enough, it's possible.
More mobility workouts in the same vein as what you did in LMR. Loved your pacing and combos of moves to keep things interesting.
A full workout with balance discs.
Also, I really appreciate when you bake in the core work and include a full stretch at the end of workouts instead of having them as separate add-ons. (Ie: if I want a shorter stretch, I can always just stop the workout after the cooldown.)
Also, if we can keep the props to a minimum. I feel like each new series has required me to buy more "gadgets", and while yes, they're useful, they're also a pain to take out, put away, and also find storage for. I don't have a dedicated workout room, just my living room, so space is a premium. Keep it to just hand weights (or barbell with hand weight modifications), a mat, and a step. (Balance discs would be needed if you did the balance disc workout suggestion, of course.)
Looking at my ask, this is quite a few workouts, lol:
1. Full body strength (including core)
2. Upper body strength (including core)
3. Lower body strength
5. Body parts biceps
6. Body parts triceps
7. Body parts back (including core)
8. Body parts chest
9. Body parts shoulders
10. Body parts quads/outer thigh (including core)
11. Body parts hamstrings/glutes
12. "To the Mat" lower body workout (including core)
13. Full body metabolic (including core)
14. HiiT cardio
15. Steady-state step cardio
16. Kickboxing cardio (including core)
17. Mobility/restoration
18. Balance workout (including core)
Oh yeah, and a great, comprehensive rotation that utilizes all of this along with the emphasis on recovery days as you see in the 12-week STS 2.0 rotation. Perhaps, in a longer rotation, include a week or two using the de-loading theory. Suggest using existing workouts in the set, but use weights that are 1/4 to 1/2 the weight of your usual weight selections.
Hope that was detailed enough. Haha - thanks for all your consideration. It's all your other inspiring work that inspires the above asks!