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Nice idea HW!

Hadn't thought of that and I really think the original question was someone who wanted to do some vertical training... but lateral thinking does work as well! :D

At least one line...

Nice!

Nah, you're also limited by neighbours, police and structural damage as noted! :D

Always use a tree, unless you've got a solid pole (not hollow) away from any residences.

Not nice!...

It only takes about two or three cans to fill your bag too, but they might not do your hands any good!

A word of caution on using beans. Make sure that the bag is hung in a permanently dry place,...