Begin in a wide squat position with feet shoulder distance apart, the feet and thighs slightly turned out, the knees and hips flexed to approximately 90°, and ensuring the knees remain in-line with the ankles and do not move in advance of the toes
The body is rotated to one side, gripping the centre of the conditioning bag, holding it by the outside edges
Ensuring the core is engaged power up to an upright standing position, rotating the core and drawing the bag diagonally across the front of the body, lifting it to rest on the shoulder opposite the starting position
Reverse the motion, squatting down and lowering the conditioning bag towards the floor to repeat for the desired reps before changing sides
Emphasise transfering the power through the feet, up through the legs, core and upper body when moving the conditioning bag
Progression
use a heavier conditioning bag, add a movement pattern (eg. lunge forward to pick the conditioning bag up before lifting it to the shoulder