When you attend an exercise class at a gym that’s well-stocked with equipment, it can feel like there are endless possibilities to switch up your sets. At home with a mat and a couple of dumbbells, maybe not so much. A few simple exercise balls can make working out in your living room or yard a lot more fun, whether you prefer yoga, high-intensity interval training, cross-training, or are rebuilding your strength in physical therapy. Here are our favorites.
