What do you guys make of this
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The heel hang is a brutal isometric contraction of the hamstrings in which you fight to hold yourself up from the downward pull of gravity. Similar to a glute ham raise, this exercise develops the posterior chain in ways that very few exercises can. By increasing the strength in the posterior chain, you will improve your leg power for jumping and sprinting.Warning - Do not perform this exercise on a bar that is more than a few inches taller than a height at which you can reach the ground with your hands in the exercise position.
If you had rings it would be easy to assist yourself with them set at the correct height.