make per second HR available

[speising]

the app displays per second heartrate for activities, but here we only see minute resolution. would it be possible to switch to per second resolution, maybe only on demand at an activity?
(i like to do a sprint8 program with 30sec sprints, which disappear completely in the minute graph)

[jlai]

The API does have support for requesting 1sec resolution heart rate, although I'd need to look into how it works in practice