"I have a simple rule: do the least amount of work necessary to achieve maximum results. This golden rule applies perfectly to cardio. Too often, clients tell me their cardio regimen and what I hear is as painful as nails scratching a black board. For this reason, I’ve decided to set the record straight. Before I go into details, keep in mind that 1) we are referring to cardio training to burn fat, not improve performance and 2) the approach below is for the ones amongst us who have jobs, kids and are not gym rats and, therefore, need to be in and out of the gym within a reasonable amount of time.