I still remember the day when i first saw the potential in my arms, i was around 13 i was skateboarding a lot i was pretty tall and very thin at the same time, but then i flexed my arm and saw my bicep in the mirror and it was mindblowing for me, i saw that this has sooo much potential.. i could a principality around it...and so i did, it was almost the same when Peter Parker discovers his new powers.. damn good times.