Fitbit tracking exercise

I am having a lot of trouble adding exercise using the Fitbit app. Until a few days ago, I would open quick actions, pick track exercise, pick log, and then choose the exercise I wanted to add, like Gym. Now, when I pick track exercise, the only option is to track a walk. I recently updated to the latest IOS 11, and am using an iPhone 5S. I have the latest version of Fitbit. Please help.
Tracy

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