Any question answered...

Cheers.

I mainly want to use it for skipping. 2mins skipping, 1 mins of press-ups/similar. Maybe also some running.

I never really considered how many I'd need. If you wanted 2min, 1min, 2min, 1min, etc. would you just need two and reset?

That's the way the Gymboss works, unfortunately you can only set 2 intervals but that's usually more than enough. So in your case you would have a 2 min, and 1 min interval. Which repeats up to 100 times as far as I recall. You can also set it to just vibrate if the beeping annoys you.