Roderick: I'll send you a text buy cheap accutane uk Nothing says "no equipment" quite like a full-body plank. Planks are a great way to work your core and abdominal muscles and, if you're just starting out, you'll probably get a burn like you've never felt before. To perform a plank, assume a good pushup stance, lower yourself onto your elbows and hold yourself there. Correct plank form consists of a 90-degree angle in your elbows, a slightly raised head and a straight back. Make sure your butt isn't too high in the air – or too low – as either error could lead to back issues. Try three one-minute sets to start out. If that's too easy, put an exercise ball under your feet to add some difficulty.