Start a new ability at 49 is an amazing challenge. Start to use me Halfbike was incredible, It filled me with new energies, and fun. It's been a long time since I had so much fun starting something new.
In the other hand, me body receive all the benefits of physical exercises, but I need to use for short periods of time, because it is demanding, and need training.
Don´t worry about the learning curve, for me was a couple of test, and only has one minor scrach in me knee.
I´m really love me new Halfbike, and it is fabulous.