Chángqī duànliàn shǐ tā bǎochí le jiànměi de tǐtài.
Regular exercise has kept him in great physical shape.
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usage
体态 refers to the overall appearance and bearing of the body - combining shape and posture. Compare 身材 (body figure/build) which focuses purely on proportions, and 姿态 (posture/attitude) which can be more behavioral. 体态 is slightly more literary.