The Galaxy S5 Active doesn't move around more often than a regular S5, but it might hold up better if you're the kind of person that does. Its rugged frame resembles a phone with a built-in Otterbox case. Customers who bought one from AT&T are now receiving an over-the-air update to the latest version of Lollipop.
The update bumps devices up to build number LMY47X.G870AUCU2COJ3. The download is 640MB, so you're going to want a Wi-Fi connection. Then you can leave 5.0 behind and say hello to the bugfixes introduced by 5.1.1. This update also equips the Galaxy S5 Active with Android for Work.
Upgrade to Android 5.1.1
Android for Work
Fix to Ultra Power Saver mode for devices using On Device Encryption
The changelog is available at the source link below.