I have been doing the Spinerval video - Clydesdales - just three times now. (This is the easiest one).
Anyway, I am now able to do the entire tape and keep up with the "Big Boys" (so to speak).
This 13 days after brain surgery, at 63 yo, for someone who has not been able to train or bike a lot this summer due to the Trigeminal Neuralgia, and the awful drugs.
I have even been wearing my HRM, and I am peaking easily at about 142, but feel absolutely no strain in my heart and have a quick recovery to about 84. I think I could go a lot faster, but am refraining right now.
So, I feel just a bit proud, and I really thank those folks who suggested the Spinervals - I have ordered another one. I see some light at the end of the tunnel for my annual degradation into non-fitness over the winter.
This is so much better than just sitting on the trainer wondering what to do.