Building Fast-Twitch Muscles

It's true that even "athletic" middle-aged people tend to neglect the development of our fast-twitch muscles. We run, we swim, we cycle, but we do lots of cardio, but far fewer sprints than we did in younger days. That, says Phil Campbell, author of "Ready, Set, Go! Synergy Fitness for Time-Crunched Adults," is a big mistake. Campbell says anaerobic exercise (short, quick-burst, gets you out-of-breath fast) is just the type of training that increases HGH (human growth hormone), which he calls "the most powerful anti-aging, and anti-middle-aging, body fat-reducing, muscle-toning agent made by your body naturally." This short piece is worth a read, and it includes an interesting chart showing the average distribution of slow, fast, and super-fast twitch muscle.