You should try to target all your major muscle groups at least twice throughout your weekly workouts. Trust us, we’ve been there. Depending on where you are starting from and what your goals are this may vary. Weight training for 20 to 30 minutes, 2 to 3 times a week is enough to see results. "Training twice in the same day can trigger accelerated muscle growth and strength gains," Mentore says. Staying On Target. I'm only 21 but I've had some bad breathing problems (unknown cause, can't afford to have them figure out what's causing it) in the past and it can get really bad if I work out for a long period of time. Turns out doubling up on the amount of daily exercise you do is … But what if working out twice in one day did mean exercising more? The overall calorie burn will be the same whether you do 30 minutes at once or break it up into two separate 15 minute workouts. Walking once or twice a day is often a matter of choice. if you do it indefinitely. While the concept may … ... On the other hand, Finn does the exact same workout as Tarkin, but he splits it up into two 50-minute workouts in one day (once in the morning and once in the evening). The one thing you need to factor in is when you are performing this cardio exercise which is extremely important for burning the most amount of body fat. Is it okay to exercise 15 minutes twice a day instead of 30 minutes once? "Training volume is an essential factor for almost all fitness goals, and training several times a day allows you to squeeze in more volume, increasing protein synthesis, metabolic capacity, and anabolic output." “For that 60-90 minutes when you’re going all out, it can be both physically and mentally draining,” he said. Working out twice a day can be great for bursting through a plateau, but it can be very difficult on your body (not to mention, your social life!) Working out twice a day can be brutal, but it can also quadruple your gains. 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