When you are viewing the splits of an activity if you tap / click on a certain split it would be great to display a tooltip with the cumulative time up until that split you have selected. I know that idea was archived in 2022 but I find it extremely useful for long and short runs to check certain points on your training like a 5k time or a 10k time.
In order to preserve the grid structure I suggest it to be a tooltip which I guess is easier to implement yet it accomplishes the functionality. alternatively if a tooltip is not an option perhaps the blue line of the split itself could contain the cumulative time either when you tap it or split by split automatically.
