1. The plank with forward arm lift exercise targets the core muscles of the abs and obliques through isometric contractions in the plank position and involves lifting one arm at a time from a straight position to parallel with the body while maintaining proper form. 2. Proper form involves keeping the elbows under the shoulders, shoulders at 90 degrees, and hips, knees, neck, ears and heels aligned while looking at the ground and keeping the core tight without rotating the hips. 3. Common form errors include arching the back by not engaging the core, lowering the hips, looking up or forward instead of down, and over-rotating the trunk, all of which can lead to injury or make the