bar path

In the SFL manual it talks about driving the weight off your chest by doing a lat spread (of sorts). This seems very counter intuitive to me, as surely that means you'd be losing your upper back tightness. Can anyone explain? Also, in the manual it says to push the bar back up in a...

Hi When attending the SFL course, I recall being told to push the bar away on the ascent. Or at least you should feel like you are pushing it away. From looking at other sources on the net, it seems the optimal path moves slightly away from you, and then moves back towards you. I feel...