There is now a new feature on the Timeline tab that enables you to see the name of the activity corresponding a point on the chart. When you look at the Timeline you’ll see a new “Click on a point to see the activity name” annotation in the top left:
If you single click on the centre of one of the points on the chart that annotation will instead show the activity name. You have to be quick as the name will disappear after a moment – if you didn’t catch the name you’ll have to click again!
If you never name your activities on Strava then the names you see here will be generic – “Morning Ride”, for example. The feature is only really useful if you’re in the habit of giving your significant activities meaningful names.
This feature does not, of course, work on the aggregated monthly view of the Timeline.