I connected my Switch to my monitor. We don't have TV. Projector, hmmm sure if it has the HDMI it can be used too.
Boxing class is really expensive. I can totally understand.
I also can't just waste my money into something I'm not yet so committed or won't do well.
Treadmill.. hmm, I usually get bored with that. That's nice that you aren't bored with it. You can also watch tv while doing that.