Some days I don't go to the gym, I'm not going to lie, either I'm busy or tired. So I do at home workouts. Jump rope, chinups on monkey bars, pushups, you name it. Sometimes if your at home workouts aren't cutting it add some weights. See below
I upped my plank weights at home by using a 26lb baby
needed more weight so added a 30lb toddler
decided the kids in my area need to workout with me so I yelled plank!