Hi bZazana/b. I have to give it to the? 40 Minute Full Body Workout. That workout is really hard. It gets my heart rate up. Christine Beauchamp Says: August 4th, 2009 at 9:04 pm. Hi Zuzanna! I would have to say, your 20 minute cardio b...../b And this is where problems might occur during the summer, because gyms usually aren't open for some time or I go somewhere on bvacation/b. Still, I want to do some exercise even then. I've been trying to figure out what would be a best ...