The UnderTone Fitness app brings transformative exercise programs right to your fingertips. Now, you can take online training to the next level with coaching from fitness & wellness expert Brad Crittenden. • Execute unique workout programs on your schedule • Gain the benefits of in-person training from the privacy of your own home • Track your fitness results • Log your nutrition • Break habits with personalized reminders • Message directly with your trainer, Brad Crittenden UNDERTONEFITNESS.