Surrogation Bias

Imagine the following situation: During the quarantine you decide to start training for a half-marathon (13.1 miles). The goal is to complete a half-marathon without any injuries. You need to increase strength and endurance. To monitor your training progress you find a free app that tracks the miles you run every day. Is tracking mileages the best way to train for the half-marathon? In other words, what are the pros and cons of having a performance measure of tracking mileages each day? Does it help you achieve the goal of completing a half-marathon without any injuries?