HIIT using a Punching Bag????

[Alex-db]

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PS. This bag is top of the line, but the top portion is much softer and gives much more than the bottom portion. Kicking low gets no give or punching low.

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This is standard for Thai-boxing, people add more in the top of the bag to make it all harder. Its to condition your shins so you're not afraid to kick someone hard knowing they might block with their shin/knee/elbow.

Like in that film where some kid was kicking a tree.