The resistance setting of spinning bike should be adjusted according to the individual's physical fitness level and goal. For people who want to slim their thighs by rotating, it is generally recommended to set the resistance within a range that can make you feel moderately challenged without causing excessive fatigue or injury.

For people who use spinning bikes for the first time, it is suggested to start with lower resistance, such as first or second gear, and then gradually increase the resistance to adapt to the intensity of exercise and avoid causing excessive pressure on the body. Gradually increasing resistance can help you control your breathing better, maintain a stable rhythm and ensure correct technical movements.

If you are already familiar with the rotation and want to increase the resistance to speed up the process of slimming thighs, you can adjust the resistance to a higher gear. But please be careful not to overdo it, so as not to put too much burden on your body.

Remember, spinning is an aerobic exercise, which can help burn fat in thighs and other parts of the body, but to achieve the effect of slimming thighs, it needs to be combined with proper diet and long-term persistence. It is also very important to keep a good diet and adequate sleep in the rotation training.

Finally, it is suggested to consult a professional coach or doctor during rotation training to ensure the correct operation method and appropriate resistance setting to avoid potential health risks.