[Superpowers] I might be invulnerable to any sort of physical damage. Need advice on stress-testing the limits of my power and finding creative applications.

Hey all,

I'm looking for some advice on testing out my powers, and while I do have some access to heavy machinery, and uh, others with powers like mine, I'd like to go at this a little more... scientifically if I can.

What I've tried:

- Stabbed myself(skin didn't tear), shot myself(chest moved back from the impact, felt the bullet push but no pain), got hit with a F150 at 55mph(ragdolled across the highway), jumped into a hole with shaped charges for clearing concrete pillars(cousin Niko had to dig me out), a hydraulic press exerting 100-ton on my chest(didn't know that you can press a shirt so thin it gets hot!), had a cousin of a cousin that can throw fireballs that blows up cars no problem(got launched at least 50 feet into the air, and I did pass out from all the oxygen in my lungs burning away), cutting lasers(that one actually was nice, like a sauna but concentrated into one spot), pepper spray(smelled horrible, and was choking a little, but didn't hurt my eyes at all), Touched a live 12,000-volt municipal substation cable with a bare hand. (Zero electrical burns, no muscle spasms or heart arrhythmia, but it created an arc light so bright I had spots in my eyes for an hour).

What sort of testing am I missing? What kind of leverages and fighting styles should I take advantage of? I can still tire, though I've noticed my stamina is getting better and better as the days go by, and I don't think I've been as sick as much since my powers(though I did catch that novel strain of the cough Dr Diabolical spread to fuck with everyone). I've noticed I still gained muscle mass, so that's good, and I still need to eat and drink and breathe and sleep.

Niko says I should try breaking through chains but I don't think that's possible with just normal human strength(unfortunately, I didn't get the full bruiser package like some others like me did). Am I just stuck being a party trick kinda guy?