This workout is a great test of gymnastic capacity with a more complex movement, the chest to bar. The way it is designed allows you attack each movement if you are capable in the movement pattern because you are switching between using the upper and lower body musculature.
Where you will find your hold up on this workout is dependent upon your chest to bar capacity. If you are efficient at C2B, then I think you will find the high box jump as the more taxing movement. Also the opposite is true, if you struggle with C2B the box Jumps won’t be approached as aggressively because you will be using it as active recovery before going back to the bar