how to clean bbq grill

This is based on the same principle as drop sets: once you hit failure on an exercise, you find a way to continue doing work. With drop sets you reduce the weight so you can get more reps in. With mechanical drop sets you keep the SAME weight on the bar or machine but you change the exercise slightly so that you gain a mechanical advantage and can continue while working the same muscles.

A mechanical drop set can include two or three variations. The order, whether you're using two or three variations, is always to start with the weakest variation and work toward the strongest. That way, when you hit failure on the first movement, you can still get some reps on the next one. Select a load that you can get 6-8 reps with on the first exercise. Take each of the two or three variations used in a set to technical failure or close to it. Remember, you're using the same weight for all the exercises selected. Take 10 seconds of rest when switching between variations. This won't negatively affect any of the growth-producing stimulus but will allow you to get 1-2 more reps per variation. – Christian Thibaudeau

Due to the cable angle (about 20-30 degrees from your torso), this single-arm shoulder press variation creates a more challenging demand on your abs and obliques with a lighter load than using a dumbbell. Why? The greater the angle of the cable to your body, the less mechanical advantage your torso muscles have to resist the force of the cable from pulling you towards its origin. – Nick Tumminello

Conventional dumbbell rear-delt flyes maximally load your arms when they're out to the sides, which is when the posterior shoulder musculature is in a shortened range. However, they neglect to strengthen the aspect of horizontal shoulder abduction when your arm is in front of, or across, your torso – when the posterior shoulder musculature is in a mid to lengthened range.
You can combine the side-lying rear-delt flye with a side-plank, which not only helps make the side plank less boring, but also serves double-duty and maximizes your training time. – Nick Tumminello

Conventional dumbbell rear-delt flyes maximally load your arms when they're out to the sides, which is when the posterior shoulder musculature is in a shortened range. However, they neglect to strengthen the aspect of horizontal shoulder abduction when your arm is in front of, or across, your torso – when the posterior shoulder musculature is in a mid to lengthened range. – Nick Tumminello