Bone-cracking impact, shin conditioning, public street bets, and everyday challengers finding out the hard reality of professional combat kicking power. Welcome to MMA Fighter Vs Strangers $100 Leg Kick Challenge!. In this viral martial arts challenge, a trained professional MMA fighter / Muay Thai practitioner hits the streets to offer bold strangers a simple proposition: take one solid leg kick, stay on your feet without flinching or collapsing, and walk away with $100 in cash.