Backing up iOS Health Data takes enormous space? I got an auto generated e-mail from Apple telling me that my iCould Drive was almost full

Dear Benny Skogberg,
Your iCloud storage is almost full. You have
499.728 MB remaining of 5 GB total storage.
            Upgrade to 50 GB for 9,00 kr per month 

Your iCloud storage is used for iCloud Mail and to keep
the most important things on your iPhone, iPad, and iPod touch safe
and available, even if you lose your device. iCloud Drive and apps
like Keynote, Pages, and Numbers also use iCloud storage to keep your
files up-to-date everywhere. To continue to use iCloud and to back up
your photos, documents, contacts, mail, and more, you need to upgrade
your iCloud storage plan or reduce the amount of storage you are
using.
The iCloud Team

Looking into the Backup, I saw the health data used more than half of the backup for it's data, and I come to think why. Do they store videos/images of health data? Other apps are less than 100 MB.
What makes the Health Data generate Gigabytes of Backup data?
How long have you kept your iPhone? For many years? The Health App stores data of your steps, walking + Running Distance, fights Climbed, etc.

You can just turn off &amp; delete the Health App data from iCloud backup. 

Or go to Health > steps > Show All Data > Edit >　Deleted All data from the app.