As an "unfit" beginner swimmer, you are currently capable of swimming 100 yards or meters without stopping. (For the rest of the text, you can interchange yards and meters.) You can repeat that 100-yard swim five or six times, with 20 seconds of rest between each repeat. The first swim workout displayed includes a 200-yard warm-up of your choice, the main set of five or six repeats of 100-yard swims and a 100 yard cool down. The rest of the swim workout descriptions follow a similar format. Before beginning the plan, take a look at the first workout. It should seem "doable."