There are two reasons major reasons why one might have cramps and extreme pumps. Imbalance in minerals (Cal, Mag, Pot, Salt) these need to be kept in balance along with water. AAS will through this profile off so it is wise to supplement these in the correct ratios. The second cause of cramps is poor tissue texture. One may have scar tissue or muscle fibers out of alignment. Proper streching can solve the issue of muscle fibers out of alignment. Therapy(Ultrasound) can help break up the scar tissue. I used to get cramps and pumps badly like 3 years ago until I started adhearding to the proper protcol to fix it. Now I can play basketball, do sprints, and have no problems what so ever and be taking like 30-40 mg of SD per day.