Today's S&C session followed the same pattern as the previous one . First, a quick Iron Core Circuit (2 Sets), then my 5/3/1 lifts (Deadlift & Bench Press), followed by 8 rounds of rope skipping with pullups after every second round. Iron Core Today, I probably found the difference between a good and a bad leg curl with single leg balance : the leg that stays on the physioball must always push down, through the ball. In other words, it's imperative to always keep the hips extended to a maximum. This way, the body's center of gravity is positioned in such a way that a lot of weight rests on the heel of the fixed foot. Therefore, the ball can't roll to the side so easily. With that in mind, the exercise is even manageable with elevated arms. Up until now, I wasn't paying enough attention to the hip extension, which resulted in me failing all aover the place and displaying less than optimal form, to say the least. I guess that's not an issue anymore...