take on, accept a challenge, responsibility, or new task, dip under, go below a particular number, time, or limit, pursue, work steadily towards achieving something, strive, make a great effort to achieve something, give somebody the edge, provide someone with a slight but important advantage, set out to do something, begin with the intention of achieving a particular goal, load, the amount of physical or mental work or stress placed on someone, exertion, great physical or mental effort, add up, have a cumulative effect over time, refine, improve something by making small, careful changes, setbacks, problems or difficulties that slow down progress

Pushing boundaries

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