Triplets (and a Quadruplet?)
The following are three note riffs which are used for fills. Practice them and get them as fast as possible. Practice! Practice! Practice!
I play them three times slow, three times intermediate and three times fast.
Play each backwards as well.
Stop and take a breath everyonce in a while. James Cotton can keep these things up with circular breathing for 5 minutes, but we are just mortals.