Looking for help with agility and power. Anybody have ideas?

[shemp]

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("going to failure" is not really a big deal to me, it just leads to quality work in my mind)

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Then your mind is your enemy. Going to failure is inconsistent with developing explosiveness. Apparently you like to do it or doing it gives you a feeling of having driven yourself. Fine. Developing both explosiveness and endurance is going to require some trade offs, but you are making a one-sided choice.

[shemp]

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Are there any other obvious agility exercises I should be doing?

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Dot drills are very big these days. But you are way over doing it with daily half hour agility drills already...