Type 2 muscle fibers are white, less dense in mitochondria, more contractile, more powerful, but fatigue very quickly.

“then you have these type two fibers and I'm oversimplifying a little bit because there are subtypes of them I understand but the type 2 fiber you know it's a more contractile it's a more powerful fiber uh Twitches a little faster but it's very fast to fatigue it's the White Fiber because it is lacking in the mitochondria”