"A team of researchers, led by scientists at Dartmouth Medical School and Dartmouth College, have identified and tested a gene that dramatically alters both muscle metabolism and performance. The researchers say that this finding could someday lead to treatment for muscle diseases, including helping the elderly who suffer from muscle deterioration and improving muscle performance in endurance athletes."

CC Increased sprinting muscle performance
TT Increased endurance muscle performance
CT Mix of sprinting and endurance muscle performance

I have always been able to run very fast for short distances.