Ximen Jinxing was prone on the roof next to the courtyard where Zhang San was staying, quietly sticking his head out just in time to see Zhang San training under the moonlight in the evening.
Zhang San picked up the stone barbell on the ground, slipped the stone weights on each end, and started to do deadlifts.
He had to admit, lifting such heavy weights gave a great sense of satisfaction and achievement each time they were pulled up.
So, Zhang San went straight for fifteen deadlifts in one set.
After the deadlifts, he felt refreshed and clear-headed.
Zhang San exhaled a breath of stale air, let his muscles recover for a moment, then went for another deadlift.
This set also felt very good.
The kind of stiff-legged deadlifts I'm doing are meant to work the lower back erector spinae muscles.
Erector spinae! Erector spinae!
However, after finishing the third set, Zhang San realized that it wasn't just his erector spinae muscles that felt engaged, his lower back did too.