Stretch (yourself) out is a common expression used to describe the act of extending the body to relieve muscle tension or simply to relax. However, there are several synonyms available that may better fit different contexts. For instance, "unwind" often describes unwinding from a stressful day, "limber up" is often used before a workout or physical activity, while "extend" might work better in a more formal context. Alternatively, "spread out" can be used to indicate expanding a certain area, while "lengthen" highlights an increase in length. Others include "relax," "loosen," and "soothe." Choosing the right synonym will depend on the desired tone and context of the sentence.