Back, Core, Shoulders
Start on the floor on your hands and knees. Lower your forearms to the floor with elbows positioned under your shoulders and your hands shoulder-width apart.
If someone looked at you from the side, your arms would form a 90-degree angle. Step your feet back, one at a time.
Maintain a straight line from heels through the top of your head, looking down at the floor, with gaze slightly in front of your face.
Now, tighten your abs and hold. While holding plank, jump of with your legs into a wider stance and then back.
Progressions And Regressions