If you have been sick or injured and have lost lean body mass, you can work to rebuild your muscle.Don’t rush back in to your workouts because you won’t be at the same baseline. You need to ease back in.Start by strength training two to three days a week with 48 hours between workouts that focus on the same muscle groups.Make sure your workouts focus on multiple joint movements such as lunges, deadlifts, rows and presses. These are the most effective ways to rebuild your muscle. Use a resistance that you can …