[Feature Request] Allow tracking of additional measurments

[AlexisOlson]

I would like to be able to track additional metrics like

Metabolic markers

• VO2 max
• Resting energy
• Walking heart rate average

Recovery indicators

• Resting heart rate
• Resting respiratory rate
• Sleep
• Heart rate variability
• Cardio recovery
• Subjective scores (e.g. tiredness/soreness)

Vital signs

• Blood pressure
• Body temperature

Activity stats

• Steps
• Distance walked / run
• Stair flights climbed

These are just a subset of many possible measurements, so it might be worth allowing custom measurements so users aren't limited to a pre-defined list.

I know this is primarily a lifting app but as long as you aren't trying to sync these stats from somewhere else like Apple Health, I'd expect it to be a simple expansion of existing functionality. If you think this request is a good idea, I'd like to try writing a PR myself.

[astashov]

The feature kinda makes sense, but I'll have postpone it for now, to avoid complicating the transitioning to the new editor, sorry! Maybe later someday.