Published date: May 22, 2019 11:41 am
To improve your fitness levels it's recommended you perform 20-60 minutes of cardio exercise at an intensity 60-90% maximal heart rate (220-age = maximal heart rate), 3-5 days a week. Work on building a strong and solid cardio foundaton first by performing 30-60 mins of cardio exercise at 60-75% maximal heart rate.
http://www.myhealthtipstoyou.com/7-fitness-lies-that-you-tell-yourself/