Hills on the treadmill💪 During the summer months I opt for more treadmill miles. I know the treadmill can be mentally tough, but what helps me get through it is if I mix it up with the elevation and speed. I will start at 3% and then increase it until I get to 20, 30 and 40%. The 40% is a tough one, hahaha #ASICSPartner #SoundMindSoundBody