As an ex-collegiate athlete, now approaching 70 years old, I feel so fortunately to have bumped into GMB. Been using it for two years+ now - first Elements, then Mobility, and now Immortality (which, as promised, I'll be using for another 1000 years.) Especially as we age, core, spinal flexibility and balance are so important. I'm actually stronger, more flexible with much more functional ability than I had at 50 or 60. Thanks everyone at GMB. Appreciate the clarity of instruction; lack of judgment; ease of use, and knowledge you all have and have shared. 🙏🏾