Because we had one in our office and I would always stand at my desk and walk around while doing calls and my colleague who had the office across from me (glass wall) would tell me I gave him anxiety lol, so he told me to sit at the desk and ride this bike thing he had, so I tried it, I hated it, I looked like a f***ing wanker trying to adjust myself in my seat to pedal faster and then you get a sweaty ass while you're in your seat because being a gym rat, you can't take something like that and just do it in a relaxing way, it's a "I need to get the most out of this" mentality.
So I would go back to walking around but then I would do lunges and then sit on the sofa when he'd tap on the window and start doing air cycling and it let me just focus on my core/abdominals and let me slow down.
I am a fidgety type of wanker, if you will, no euphemism, I always have my leg shaking when I sit, or I am playing around with a pen, clicking it or taking it apart and putting it back together, so my fiancé got so annoyed at me at one point, she got me a fidget cube and I keep it with me at all times. It's why I workout a lot, I feel like a caged animal sometimes.