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With the Train Me Online App, you can start tracking your workouts and meals, measuring results, and achieving your fitness goals, all with the help of your personal trainer. Download the app today! And be sure to check out our website at: trainmeonline1.trainerize.com
From version TMO 6.9.14:

We’ve introduced the ability to edit and delete in-app messages. Just one more way we’re making client-trainer communication a whole lot easier.
As usual, we’ve also made some other back-end upgrades to make your experience even better.