I have dealt with arm pump so bad that I was almost was thinking about selling my bike. Have not ridden in months and today I went to the same track as always (indoors). Had vey minimal arm pump. I rode more today than 3 days of riding before. Now here is the only only difference. I am 3 days on the Atkins diet, No carbs. And also I drank no soda, just 3 bottles of water to the track, I stay thirsty on this diet. So do you guys think any of these had anything to do with it.