I was told that you should switch your routine up atleast every 3 weeks to keep your body guessing. Otherwise it's not as effective, so switching it up all the time is a great way to work out. As the above posters states, as long as it keeps you exercising, it doesn't really matter if you never finish a program. As it is now I do yoga, zumba, running, walking, and weightlifting. Which one I do depends on my mood. Variation is key!
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