• Cardio does not have to be boring or monotonous, and these cardio machines will prove it. Here are 10 of the best cardio machines, according to certified trainers.As for how much and how often you should be doing cardio, you should try to aim to do three to four cardio workouts at week, each time for 30 minutes to an hour, says Kanski. \"Our bodies are extremely adaptive and can lose progress very quickly, so it’s important to stay consistent. The more we are over time, the better the results and improved endurance.
  

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