Building Muscle either for swimming improvements or just to look better requires good attention to both your training and diet. Protein should be a big part of your diet in order to increase your muscle size and strength.
then rest and a good diet rebuilds your muscles bigger and stronger
FACT: Did you know that 22% of your muscles are protein!
What Is The Right Way Top Go About My Nutrition And Training?
BEFORE workouts
You will need high levels of protein and Carbohydrates try a protein shake from a good company.
DURING workouts
Try using a sport drink or at least drink plenty of water.
AFTER workouts
Another protein drink, try to have one within 30 mins of finishing your session.
if your are serious about building muscle then you should ditch the 3 meals a day mind set, aim for small meals throughout the day, eat plenty of fruit and nuts as well as protein drinks. Also consider using a good multi vitamin to help your body recover from your training.
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