on't have big thighs or calves.
Not exactly small.
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PLENTY of things contribute to explosive ability, way, way down on that list is your squat max.
Natural ability aside, people need a greater appreciation for the specificity of training, and the body's adaptation to specific stress. Lifting heavy weights can improve your performance in a lot of things, but what it really makes you good at is, surprise, lifting height weights. The reason professional athletes look they way they look, is because they train specifically to perform their sport, and their physiques are a consequence of that.