That’s exactly what I do for my Apple Watch Series 6 too! If you follow me on Strava I only do mainly fitness+ workouts for 30-90 minutes a day. Yesterday, my battery was more stable. I’m back to charging it twice a day, which works perfectly for me since I don’t wear an ultra. Ultras should be fine if you only need to charge every other day.
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According to Apple’s website, the Workout Buddy is for all Apple Watch running this new beta. But your paired iPhone must have Apple Intelligence since this feature uses AI and generative features for the text-to-speech to sound more like the Fitness+ trainers’ voice. The examples show that during a run, the voice feedback is more personalized, and instead of the Siri voice, it sounds like Sam Sanchez. You can also set it based on other treadmill or Time to Run trainers like Jamie-Ray or any other Fitness+ trainer included to generate the voice feedback from.
My Apple Watch Series 6 in gold stainless steel has this feature because I have an iPhone 15 Pro running Apple Intelligence on iOS 26 beta. What iPhone do you have?