Yoga newbie

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I need to get back on track with living a healthy lifestyle and I've decided to download Down Dog, it's a yoga app. I tried for the first time and it was so hard lol. My balance was off a little and I honestly didn't give yoga any credit, but after 30 minutes of yoga, I felt whipped. Yoga kicked my **s lol. I'll never underestimate yoga again.....Do you have suggestions? My app is good but if there's anymore I can try and see which one I'm more comfortable with because this app I'm using for beginners seems like it's for advance level even though I set it on beginners.