I didn’t say it in the video, but you can see I brought my knees up to meet the dumbbells at the end of the set. Save your joints. Kick the weights up into position to begin; bring the knees up to catch them at the end.

Notice my upper arm path. Not stretched out wide (incorporating much more deltoid), not right along-side my ribcage either; somewhere in between. Different for each body, but feel out the range starting from roughly 45° from the ribcage and search for where the tension on the upper pectoral is greatest for you. That’s your arm path.