Which type of lever is for strength?

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When a lever is arranged so the load sits between the pivot (fulcrum) and the effort, you get a mechanical advantage that makes it easier to move a heavy load with less muscle force. In the body this means you can generate a larger output force for a given effort, which is the essence of strength. A clear example is standing on tiptoes: the ankle joint acts as the pivot, your body weight is the load between that pivot and where the calf muscle pulls, and the calf muscle provides the effort. Because the load is closer to the pivot than the point where the force is applied, less force is needed to lift the load, producing greater strength. The other lever configurations focus more on balance or speed and range of motion rather than maximizing force.