Why don't reptiles need exercise?

Reptiles are ectothermic, meaning they rely on external heat sources to regulate their body temperature, which affects their metabolism and energy levels. Unlike mammals, they have lower energy requirements and can maintain their bodily functions with minimal movement. Additionally, many reptiles lead a more sedentary lifestyle, using basking and resting periods to conserve energy rather than engaging in regular exercise. This adaptation allows them to survive in environments where food may be scarce or hard to obtain.