"Doing resistance training, specifically strength training will help you to build or maintain your current muscle mass," which you need to burn fat and get stronger. Start off with twice a week, then NASM-certified personal trainer Sam Altieri said to build up to three to four sessions a week. Use a variety of equipment including kettlebells, dumbbells, barbells, and your own bodyweight. Don't be afraid to lift heavy — it won't make you bulky, it'll help you get lean and toned.