Arnold worked out six days a week back in the day because he could still make or maintain gains. Obviously when this was said “Train no more than 4 days per week.” it was targeted at “individuals who have a hard time gaining weight”. You don’t workout as much if you can’t gain weight. You need to burn less calories or eat more to gain weight while working out. Obviously you cannot workout 6 days a week and gain weight if you’re burning too many calories or not eating enough. Therefor, workout less days to gain weight because you’re not as awesome as Arnold.
Glutamine is an amino acid that is found in your muscles. Research has shown that after an intense workout, the glutamine levels in your body can drop by as much as 50%. Glutamine is also essential to keep your immune system functioning properly. As we all know, a poor immune system can leave you feeling weak and sick. According to a study by Trinity and All Saints University College, a routine supplementation of glutamine post-workout can help lessen the change of injury, improve immune function and help you recover faster after over training. 2 grams of L-glutamine daily is all that you need.