The Graphing on Garmin Connect needs to have the scales set better.
Everything looks flat, the Heart Rate, the altitude etc.
For Altitude in this example:
Instead of have the max scale of 200metres when the max you did was 150metres (for example) scale it so the max in the graphs is the max you did or just a bit over.
You get a better perspective of the graphs visually.
As you can in this example.
Endomondo scales to 175 metres, (max was 155)
https://www.endomondo.com/workouts/493763829/48323#
But Garmin Connect scales to 200 metres
https://connect.garmin.com/modern/activity/731641712
Endomondo Graphs is visually better to get an idea of the terrain.