Easy. Backward. You'll end up with stronger calves/glutes/arches and flexibility throughout your trunk from twisting.

If you have to jump on one leg you'll be left with imbalanced musculature creating all sorts of skeletal issues.

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I went to high school with a kid who was the only guy on the basketball team that could slam. He used to jump all the way to school on one leg and all the way home on the other. We would ride by on the bus and see him hopping along. But he had some serious vert.