Take advantage of your fitness and transition to a running focus for a post-season marathon. This doesn’t mean that you should ditch your bike and wetsuit and triple your running mileage. There’s an art to transitioning as you work to maintain fitness while refocusing your efforts on running. Put simply, by continuing with endurance-based rides, you improve your cardiovascular fitness, which will transfer to running.
Since running is a high-impact activity, however, it is important to prepare your body for the pounding with some additional run workouts. While you may continue with biking mileage, swim workouts are commonly reduced when training for a half-marathon. If you have been working to improve your swim, however, keep swimming 1–2 times per week to ensure that form and efficiency aren’t lost.