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When I was in the Marine Corps, I was being trained on how to properly climb a rope, utilizing the feet to assist with the climbing process. 

I don't know why, but I couldn't seem to get the technique down. I became so frustrated, that I trained my upper body hard enough to climb the rope with my hands only. 

To me, this was an amazing feat, because not many people were able to do it.

I'm not an athlete nor do I engage in athletics so if I mention the below as the most amazing physical fear I've managed to pull off then it matters to me. Recently I went for a job screening into a paramilitary agency and one of the requirement was to run a distance of 2KM in 25 minutes. At first I was like these guys gotta be kidding me. I hate to walk and now they say run like seriously.

Anyway at the sound of the whistle I took to my heels and ran as fast as my legs could carry me and at intervals I felt like fainting but I kept running because I know how badly I need the job. I was able to get to the finish line at 20minutes. I was amazed. Okay like I fell on the ground first and tried to catch my breath.

For someone like me who is not an athlete. This is a great physical feat to me.

Getting my wife to marry me

Absolutely herculean effort

The gods themselves marvelled at my accomplishment