My lifetime of cycling set me up for back failures, and no matter what I tried - I could never make up for the deficiency of having a very curved lumbar spine.

However, it was marathon running that finally triggered a full blown herniated disc and subsequent sciatica.

Word to the wise - if you feel back or butt pain, or foot numbness or leg tingling - stop what you are doing and CHANGE your fitness routine or equipment.

Don't be a RICHARD cranium........