Challenge Accepted!

I Trained Like A Black Belt For 90 Days

I Tried Secret Service Academy

I Trained Like A Chess Grandmaster

Barney Stinson - Challenge Accepted Compilation from How I Met Your Mother

I Tried Flight Attendant Academy

Whatever The Situation: Challenge Accepted!

I Tried Delivering A Baby

I Tried Etiquette School

I Tried Ghost Hunting

I Tried FBI Hostage Negotiation

I Trained Like An Olympic Boxer

I Tried Fire Academy

I Tried Houdini's Deadliest Trick

I Tried Police Academy

I Tried A Nuclear War Simulation

I Tried Paramedic Academy