I've actually learned a ton by simply requesting the data from Apple via their export in the Apple Health app, and then loading it into Claude Cowork and letting it analyze it. I also have about 4GB of data dating back 2015. You can isolate a few dimensions you're interested in and let it guide you. You can also ask it to export that data only and then dump it into Lovable for example to build a small dashboard. For the longest hikes, that would require regular outputs... So I'd recommend that auto-export app, or, if you save them into Strava, building something to extract from you and your friends' accounts to build a leaderboard. Do it!