Aerobics build oxygen usage systems in your body, but does very little to burn fat over several hours. Many times, it adds to fat content. But, for every pound of muscle you build, you burn 50 calories more per day merely sitting. So, run less and lift more.
George Mangum M.A is the fitness director for Heritage Medical Group & Heritage LifeFit Fitness Dep, which has fitness programs for all age groups. Contact him at firstname.lastname@example.org