For people who want to lose weight, it is a good choice to choose fruits with low sugar content. Here are some low-sugar fruits suitable for fitness and weight loss:

1. Strawberry: Strawberry is rich in vitamin C and fiber, and low in calories.

2. Blueberries: Blueberries are rich in antioxidants, which are important for maintaining cardiovascular health and anti-aging.

3. Lemon: Lemon is alkaline, which can help balance the pH in the body and help to lose weight.

4. Watermelon: Watermelon contains a lot of water, which helps to keep water and has low calories.

5. Oranges: Oranges are rich in vitamin C, which can enhance the immune system function and have antioxidant effects.

6. Grapefruit: Grapefruit is rich in vitamin C and fiber, which helps digestion and promotes metabolism.

7. Apples: Apples are rich in fiber and antioxidants, which helps to control appetite and satiety.

8. Peaches: Peaches contain vitamin A and vitamin C, which can promote intestinal health and antioxidation.

9. Pear: Pear is rich in fiber and water, which helps digestion and control appetite.

10. Apricot: Apricot is rich in vitamin A and vitamin C and has antioxidant effect.

Please note that although the sugar content of these fruits is relatively low, they are still natural sources of sugar. Proper intake, balanced diet and moderate exercise can achieve better weight loss effect.