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so long as your giving each muscle group enough recovery time before working them again it should be ok. having the extra protein shake would depend on how much total protein you are getting throughout the day and how the calories fit into your normal diet.
for a strength training athlete you need 1.2 - 1.6 grams of protein per kg of bodyweight per day
more importantly you should be having some carbs within 20 minute of your workout to aid recovery and protein within 2 hours.
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