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I am just curious, if I sit on a hard surface or ride a bike or a Peloton, can I accidentally trigger my pump or is it not that easy?

I can't speak for Coloplast but my AMS pump requires a deliberate quick squeeze to switch to pump mode.
Btw, this quick squeeze doesn't seem to move much if any saline. It only seems to run the pump valve. I count it as a pump but at best it might only be a half pump.
Just for your future consideration. This is worrying about non existent stuff. Don't let your mind descend into "what ifs". An implant does as you tell it to. It isn't something from the movie Maximum Overdrive. True some can be finicky but most just work as designed.
I wish that I had a car this trouble free.

Titan here. Auto-inflation never an issue. I’ve ridden my bike and sat on hard surfaces many times.

Maybe to clear my post up a little. Its easy to activate my pump. But the process is a very deliberate squeeze in only one small spot. I can't imagine being able to do that in a normal day to day activity.
Deflating is very similar. A gentle squeeze in a very special small spot.