Improving one's constitution or physical condition through changes like diet, exercise, or lifestyle—often used in health and medical contexts.
医師の勧めで、体質改善のために食生活を見直した。
On the doctor's advice, I revised my diet to improve my constitution.
運動と十分な睡眠は体質改善に欠かせない。
Exercise and sufficient sleep are indispensable for improving physical constitution.
漢方薬を取り入れて体質改善を目指す人もいる。
Some people aim to improve their constitution by using traditional Chinese/Japanese herbal medicine.