Suppose How to train for a marathon<br>Start with a training plan that includes running, cross-training, and rest days. Gradually increase your mileage each week to build endurance. Incorporate speedwork and hill training to improve your speed and strength. Don't forget to listen to your body and take rest days when needed.
Can we infer that "You should train for a marathon by only running without incorporating cross-training or rest days"? Yes, no, or maybe?