Throughout my class, we not only jumped, but lifted our arms, used sand bag weights and performed a few series of planks. (stylecaster.com)
I've seen «mentors» sand bag in many areas in business and volunteer work, people tend to protect their turf so to speak in many ways. (biggerpockets.com)
My thigh muscles felt heavy enough to rip loose and drop like sand bags down through my feet through the mountain. (si.com)