Second to running 5-6x per week, I still think Body Pump 3-4x per week is a great way to build muscle and overall fitness. Especially if you have knee issues from running in your younger days. The classes are only one hour:
edit: I wear knee supports under my clothes for this class.[/quote]
Fat cannot be directly converted into muscle (it’s science). Accordingly, cardio and weight training will not convert fat into muscle. However, weight training will stimulate muscle growth.