If you can do a set of 10 pullups with clean, good form you are doing great!!! That will make you about as strong as your body can "naturally" get.. without lifting heavy iron.

I was once in an actual (non-metaphorical) "boating accident" at sunset. The boat flooded but we managed to steer it towards an unclimbable seawall with a ladder where the lowest rung was 0.5m over my head.

The only way out of the boat and to summon rescue for the other passengers was to pull-up and/or 'muscle up' the ladder. It was either that or spend a cold night, waves sloshing us constantly, in a flooded boat and waiting for someone to (hopefully) see and rescue us at dawn.

I was able to 'pull up' my body and climb the ladder with relative ease and confidence and go into town to get help. At that moment, all my training paid off. It wasn't about looks or enjoyment - my strength was an invaluable survival asset.

Another thing i learned from that incident was to carry a knife. We had tied up the boat with a rope and there was current that put enough pressure on the rope that there was no possible way to loosen the knot and let us be towed away. Thankfully, the rescuer had a knife and cut us free.