During long rides, improper posture, movements, and bike components can cause discomfort in different parts of the body. When you feel pain, be alert—identify the cause and correct it promptly.
        1. Achilles Tendon
　　    The Achilles tendon is located at the back of the ankle, connecting the calf muscle to the heel. Pain in this area indicates a problem with your pedaling technique. If your saddle is too high, you may have to pedal using only your toes, and excessive force over time can damage the tendon. On long trips, try pedaling with different parts of your foot to avoid over-tensing the tendon.
        2. Ankle
　　    The above conditions can also lead to ankle pain. If you have flat feet, placing an orthotic pad in your shoe can help. If the crank or pedals are bent, your feet may swing back and forth or side to side while cycling, which can also cause ankle discomfort.
       3. Back
　　    Back pain is usually caused by poor riding posture. While cycling, your back should be slightly arched, and your hips and shoulders should not slump. This way, bumps will cause only a slight additional arch in your back, which is harmless. If your back slumps, bumps can push it further down, leading to serious spinal pain.
　　    Many people who experience back discomfort raise their handlebars too high to sit upright and keep their spine straight, but this is incorrect. When cycling on rough terrain, a straight spine lacks cushioning, and bumps can compress the spinal joints together, worsening back pain.
       4. Feet
　　    Foot discomfort is often caused by shoes and socks. A sole that’s too soft concentrates pressure on the feet, and a high gear ratio forces you to pedal with excessive force, both of which can lead to foot pain. Good shoes and socks can prevent blisters and chafing.
       5. Fingers
　　    Long rides can cause finger numbness—you should move your fingers around occasionally. Wearing full-finger gloves can prevent the palms from getting rubbed raw.
　　    Poor upper-body posture can cause discomfort in the hands, shoulders, and elbows. Between the two thick pads on the palms lies an important nerve—avoid putting pressure on it. Don’t use gloves with thick foam (sponge), as the foam can fill the gap between the pads and squeeze the nerve when gripping the handlebars. The same principle applies to the saddle. While cycling, your hands and arms should be in a straight line, with your wrists relaxed.
        6. Knees
　　    Knee pain is a common issue, mainly caused by the following factors:
　　    (1) Pedaling forcefully or using too high a gear ratio when your muscles aren’t strong enough
　　    (2) A saddle that’s too low, causing excessive knee bending
　　    (3) Pedaling with your legs swinging side to side, which wears down the knees. Pay attention to whether your knees wobble while cycling—consciously correct it to ensure smooth motion. Strengthening your thigh muscles can make your pedaling more stable.
        7. Shoulders
　　    A saddle that tilts too far forward shifts too much of your body weight onto your arms, which can damage your shoulders over time. Handlebars that are too narrow can squeeze your shoulders and chest, causing discomfort.