The antonyms for the phrase "straining oneself" can be words such as relaxing, taking it easy, resting, unwinding, or loosening up. Straining oneself can refer to physically or mentally overexerting the body, and antonyms for this could be taking a break or slowing down. In certain situations, people may feel pressured or anxious, which can lead to straining oneself, and they might benefit from practicing antonyms such as calming down or finding peace. Similarly, when working on a project or task, individuals can avoid overworking themselves by finding balance and working within their capabilities, which is an antonym for straining oneself.