I like that idea. I do a heavy bag and speed bag in my garage. Many times I do the speed bag as part of the warm up. The heavy bag if done properly is pretty taxing (for me anyway). I used to do it for fun after my runs on the off days. Not very often but some.
"Permanence, perseverance and persistence in spite of all obstacles, discouragement, and impossibilities: It is this, that in all things distinguishes the strong soul from the weak”