> low weight, high rep training builds red "twitch" muscle and high weight, low rep training builds white "slow" muscle I think it's the other way around. The

> low weight, high rep training builds red "twitch" muscle and high weight, low rep training builds white "slow" muscle I think it's the other way around. The first reference I found was http://www.teenbodybuilding.com/shane6.htm http://www.teenbodybuilding.com/shane6.htm If it worked like you described then you'd have marathon runners lifting huge weights in training and sprinters would be running long distance to improve.