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Hey, welcome to the Fitbit Community @MishyMish! 
I have never used my Fitbit app to track my activities. How were you using it? Did you use to manually log that type of exercises? Are you referring to activities that requires GPS?
To know how's the best way to track your activities with your new Charge 2 I'd recommend taking a look at this article.
I always go for my shortcuts. 
Note that you can customize your exercise menu by doing the following:
- From the Fitbit app dashboard, tap the Account icon.
- Tap your tracker tile.
- Tap Exercise Shortcuts.
- To add a new shortcut, tap Exercise Shortcut and select an exercise.
- To remove a shortcut, swipe left on an exercise name, then tap Delete.
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Community Moderators ensure that conversations are friendly, factual, and on-topic. We're here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
Hey, welcome to the Fitbit Community @MishyMish! I have never used my Fitbit app to track my activities. How were you using it? Did you use to manually log that type of exercises? Are you referring to activities that requires GPS?
To know how's the best way to track your activities with your new Charge 2 I'd recommend taking a look at this article.
I always go for my shortcuts. Note that you can customize your exercise menu by doing the following:
- From the Fitbit app dashboard, tap the Account icon.
- Tap your tracker tile.
- Tap Exercise Shortcuts.
- To add a new shortcut, tap Exercise Shortcut and select an exercise.
- To remove a shortcut, swipe left on an exercise name, then tap Delete.
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@MishyMish I would say that the prevailing opinion (make that hype or marketing tool) is that exercises that are started and stopped from the tracker (multi-sport or exercise mode) better reflect your calorie burn. The calorie burn is derived from your heart rate response to additional effort.
When you say you are using the app, does that mean you are tapping on the exercise tile, then the stopwatch to get to the track/log screen? When you manually log an exercise, the calorie burn is derived from proprietary algorithms based on gender, weight and age. I believe that any exercise that is completely, manually logged will overwrite any data that was captured by the tracker at the same time.
Which is more accurate? Who knows? Fitbit will stand by its products. But a recent article had subjects exercising while wearing a number or wrist worn, heart rated based activity monitors all at the same time -- while doing indirect calorimetry. The results are discouraging. All the trackers had a lot of error.
These are my take home messages. Number one -- Fitbit wants you to believe that the heart rate based calorie burns are more accurate. Number two -- trackers are not scientific devices -- they are activity monitor of unverified accuracy. Number three -- don't eat that doughnut because your Fitbit just told you that you burned 750 calories on the treadmill.
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