Yes, simply head to the WithU x AA Smartfuel redemption page here: https://withutraining.com/aasmartfuel
Enter your AA card number and email address to connect your WithU and Smartfuel accounts. You will be sent a confirmation code to input. Once that is verified, you will be shown the offer information.
If you are currently on a free WithU subscription, you will be asked to enter your payment details as well.