If you ride swaybacked, bumps will cause the back to bow even farther in the forward direction, which can lead to severe lumbar pain. Road irregularities will jam the vertebrae together, often aggravating existing back problems. The bolt-upright posture is comfortable if you're sitting stationary on the bike, but is not suitable for riding much faster than a brisk walk. Feet Foot discomfort is often the result of inappropriate footwear, specifically shoes with soft soles that concentrate the pedal pressure on isolated parts of the foot. It can also be related to riding in a too- high gear , which results in more pressure of the foot against the pedal.
Some cyclists are hypersensitive to having their feet overheat while riding.
An excellent solution to this is to wear cycling sandals. In practice, however, they are very comfortable in warm weather. For longer rides with sandals, you should wear socks to protect against chafing. Fingers Numbness of the fingers is a potentially dangerous symptom, often related to carpal tunnel syndrome. This is one of many problems which can result from bad upper body posture .