Hey, you gotta start somewhere and i can tell you just from the past week of me doing cardio that even 15 minutes DOES help if youve been a couch potato your whole life. I've bumped it up to 20 minutes this week. I didn't want to go in full force and then end up quitting so I'm conditioning myself before I go for 30 minutes. I'm never sore afterwards and I don't become fatigued until about 11 minutes in, whereas when I first started I was beconing heavy footed after about 5 minutes. I also run everyday.
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