Here's a quick look at Strava's new Statmaps, which allow you to quickly add hashtags to create overlays atop maps within your Strava feed.

All the official tags are listed here:

Pace #PaceMap - Darker colors are faster paces
Speed #SpeedMap - Darker colors are faster speeds
Heart Rate #HeartrateMap - Darker colors are higher heart rates
Elevation (Absolute) #ElevationMap - Darker colors are higher elevation/altitudes
Elevation (Gradient) #GradientMap - Red is climbing, Green is descending
Power #PowerMap - Darker colors are higher power outputs
Time #TimeMap - Darker colors appear later in the activity
Temperature #TemperatureMap - Red is hotter