Originally Posted by timmhaan
this will have to be the solution.
last night, for fun, i did 10 repeats of our 6 story staircase with a backpack full of heavy books, a bunch of squats with backpack, and some lunges.
it's just not going to be enough, my legs weren't even sore this morning.
Use rocks, bricks, or bags of sand. If that doesn't do it, get a bigger backpack.