I spent the entire day working and did yoga twice today. (In that case you didn’t spend the entire day working because you did yoga!) Actually, I could have exercised more if I hadn’t been playing on my phone so much. As a beginner, I can’t practice complex poses, so it is easy to feel bored in this start-up phase. I kept telling myself to be patient and persevere, because I think yoga is the most accessible way to exercise. Unlike running or working out in the gym, which require a track, a gym, or other amenities, I will be able to practice yoga almost anywhere, anytime if I master it to some extent.

I spent the entire day working and did yoga twice today. (Good!) Actually, I could have exercise more if I hadn’t played on my phone at times. (Use "exercised" instead of "exercise") As a beginner, I couldn’t practice complex poses, so It’s easy to feel bored at this start-up phrase. (Use "can't" instead of "couldn't", and use "it's" instead of "It's) I kept telling myself to be patient and persevere, because I think yoga is the most accessible way to exercise. (Use "keep" instead of "kept". Also, there is no need to use a comma in this sentence. However, if you rearrange the syntax, then you will need to use the comma. For example: "Because I think yoga is the most accessible way to exercise, I keep telling myself to be patient and persevere." ) Unlike running and working out in the gym, which require a track, a gym, or other amenities, I can practice yoga almost anywhere and anytime if I master it at some extent. (Use "to some extent" instead of "at some extent." Also, it is better to use "yoga" instead of "I" as the subject of the main clause because you are comparing "yoga" to "running and working out in the gym." You are not comparing "I" to "running and working out in the gym." Try making the main clause passive, like this: "Unlike running and working out in the gym, which require a track, a gym, or other amenities, yoga can be practiced almost anywhere and anytime if I master it to some extent. Great narrative! Thank you!