Tone up is a term used to describe the process of improving one's physical fitness. The crossword solutions for this term are CONDITION (9 letters), GETFIRM (7 letters), and GETINSHAPE (10 letters). Conditioning is a form of exercise that focuses on improving strength, flexibility, and endurance. GETFIRM is a phrase that implies strengthening the body through exercise. GETINSHAPE is a phrase that implies improving one's physical fitness through exercise.