Talk about an Isometric exercise! With resistance! Likely makes a Isometric plank seem easy....
Yeah, no. Jumping out of a perfectly good, still flying airplane is bad enough. Old co-worker got into that, right up until one of his jump buddies augered-in and left behind a young wife and a little girl. I put wing suits and multi-pitch free-climbing in the same category of NOPE. Just too many variables beyond your control, any one of which can kill you without blinking.