Hi from USA. My name is Steve. I just started riding 6 months ago. Instead of buying a treadmill, I decided to get a unicycle and exercise your brain as well as your muscles.
I first bought a cheap 20" unicycle off Amazon (I think is was $75). After about 3 months, I bought a Nimbus 20". I should have started with the Nimbus - is has the right size cranks (125 mm) and a better shaped saddle (it’s flatter and not so ‘U’ shaped).
Oh - one thing I didn’t mention - I’m 65 years old and I’ve ever rode a unicycle in the past!