Will the treadmill build my leg strength and endurance?

Treadmill training is a good form of training because you can control the type of response you are looking for. If you are looking for leg strength, then you want to complete hill climbs. This is achieved by doing intervals using the incline. Slowly increase the incline every minute until you can no longer maintain the speed. At this point, drop the incline down to zero and continue at a recovery speed for a few minutes before repeating. The goal is to achieve a higher incline threshold over time; this will show an increase in leg strength. You can also improve your endurance using a treadmill. To improve endurance, select a steady-state workload (incline and speed) that you can maintain for 40-60 minutes. Combining two longer intervals at higher inclines can also help with leg strength and endurance if you are completing long durations that continue to overload your legs.