So, I've been training for the Boston Marathon and I'm up to 40 miles per week. I am twitching my ass off! Here is what is going on:* My tongue is twitching off the charts. Pops, flickers, flutters, and machine gun twitches on all sides.* BOTH biceps are twitching hotspots for weeks. I can just sit and watch the both firing away.* My abdomen is twitching way more than normal* My left testicle has been firing nonstop since mid-November (3 months)I've been running up to 17 miles at a time and I think its really fueling the twitching (I think). I found a doctor describe it this way:* Long workouts cause lactic acid (or actually, lactate) to build up, causing lack of oxygen. Dr. Plancher adds, “This alters the way the muscles contract as well, possibly causing twitching.” * Lactate is a good thing: It promotes fat burning by initiating a chain reaction that leads to a spike in growth hormone production. Growth hormone burns fat!* So next time your muscles are twitching after exercise, remind yourself that this means you probably worked out hard enough to ignite some post-exercise fat burning. And that’s always a great result.Its weird that my running has seemingly caused my upper arms to twitch relentlessly but I do pump my arms with every step so I guess that could explain it. Just wanted to post my experience. My neuro actually thought the running would decrease my twitching but I have not been that lucky.Matt