I had triple bypass at 42, so I took up riding bikes on local rails to trails afterward for continued cardiac therapy. After getting up to about 20 mile rides, I got chronic tendinitis in both ankles and had to hang up bike riding. (I’m a foot and ankle surgeon,n, so I knew there weren’t many satisfactory treatments for this kind of tendinitis except to stop the activity that caused it).
The strokes destroyed my balance, so I test drove several tadpole trikes. I had not been on bikes for 8 years at the time, but the tendinitis recurred within a day of test driving the trikes.
Fortunately, e bikes supply enough torque that I don’t have to pedal as hard going up hills, which caused the tendinitis in the first place.
I’ve only put about 75 miles on my new e bike, but so far no recurrence of the tendinitis.