Exert yourself is a phrase often used to describe putting forth physical effort to accomplish a task. However, there are many other synonyms that can be used to convey a similar meaning. Some other options include: strive, labor, toil, push oneself, exhaust oneself, work hard, break a sweat, and give it one's all. Each of these phrases can be used effectively to convey the idea that one is putting forth great effort to achieve a goal. The specific synonym chosen may depend on the context of the situation, the tone desired, and the message the writer or speaker wishes to convey.