Hello @jessmav, welcome aboard to our Fitbit Community! If you want your exercises from MapMyRun are shared this information is not synced to Fitbit, since MapMyFitness activity programs doesn't sync to Fitbit. Although Fitbit is capable to sync distance and calories to MMR.
With MyFitnessPal integration it works differently, so in this case you should be able to see exercises logged on MFP shared on your Fitbit Dashboard exercise history. In this case my recommendation is to make sure MFP is connected with your Fitbit account under your applications settings. For more details about this process the following post might be of your interest.
Keep me posted how it goes, I'll be around if you need more help.
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