For every endpoint, we should check the Strava API docs for the correct return type

[lwasser]

For every endpoint, we should check the Strava API docs for the correct return type

Originally posted by @jsamoocha in #505 (comment)

I'm just turning this into an issue so we remember to do it. i'm happy to help with this when we are ready to do it.

[jsamoocha]

Copying this list from #250 for reference. We can let one another know what we're working on by checking the boxes below:

• /athletes/{id}/stats (GET)
• /athlete (GET)
• /athlete (PUT)
• /athlete/zones (GET)
• /segments/{id} (GET)
• /segments/starred (GET)
• /segments/{id}/starred (PUT) - NOT IMPLEMENTED AT ALL
• /segment_efforts (GET)
• /segments/explore (GET)
• /segment_efforts/{id} (GET)
• /activities (POST)
• /activities/{id} (GET)
• /activities/{id} (PUT)
• /athlete/activities (GET)
• /activities/{id}/laps (GET)
• /activities/{id}/zones (GET)
• /activities/{id}/comments (GET) law
• /activities/{id}/kudos (GET)
• /clubs/{id} (GET)
• /clubs/{id}/members (GET)
• /clubs/{id}/admins (GET)
• /clubs/{id}/activities (GET)
• /athlete/clubs (GET)
• /gear/{id} (GET)
• /routes/{id} (GET)
• /athletes/{id}/routes (GET)
• /routes/{id}/export_gpx (GET)
• /routes/{id}/export_tcx (GET)
• /uploads (POST)
• /uploads/{uploadId} (GET)
• /activities/{id}/streams (GET)
• /segment_efforts/{id}/streams (GET)
• /segments/{id}/streams (GET)
• /routes/{id}/streams (GET)