Your bodyweight builds the front delts.
Walk your feet forward to make it harder, keep your body in one straight line.
This flips the front raise on its head, instead of lifting a weight, your straight arms lever your leaning bodyweight upright through the straps. The front delts drive the entire movement as you raise the handles overhead, and your body angle is the loading dial, the further your feet walk forward, the heavier every degree of the raise becomes. It builds front delt strength with nothing but straps and gravity, and it doubles as sneaky core work since your body must hold one rigid line throughout.
Move your feet. Stepping back toward the anchor makes you more upright and lighter, walking your feet forward increases the lean and loads the delts harder. Find the angle where you can complete clean reps.
Primarily the front delts, which lever your bodyweight up through straight arms. Your trunk also has to stay rigid from head to heels the whole time, so you get a plank-style stability bonus for free.
Shaking usually means the angle is too aggressive for your current strength, the delts and stabilisers are maxing out. Step back to an easier lean, own the full range, and progress the angle gradually.
