提高体质在英语中可以表达为以下几种方式：
- Improve physical fitness
- Enhance physical condition
- Boost physical health
- Strengthen one’s body
- Increase one’s physical strength and stamina
- Better physical wellbeing
- Promote overall physical health
- Step up physical fitness levels
- Work on physical health
- Improve one’s body composition
根据具体的语境，你可以选择最合适的表达方式。