Taking on a fitness challenge is great for developing strength and endurance, but vowing to do 100 squats a day… every day? It sounds brutal, but writer Anna Bartter says it’s one of the most effective lower body workouts she’s ever done – and it’s not as prohibitively advanced as it sounds. “The gains I noticed over the month were more than physical,” says Anna. So, if you’re looking to get both physically and mentally strong without leaving your living room, this might be the challenge for you.