Switch on the music and I am up for a challenge! This time is PLANK.... Key takeaways: Planks offer total-body engagement, working the legs, core, back, arms, and shoulders. The isometric exercise can build muscle strength and endurance. Planks don't require equipment and can be done anywhere, making them convenient for people of different fitness levels. #plank #plankchallenge #fitness #fitmom #fitat44 #strong Will you try this challenge?