Work a good honest day's hard physical labour.
Lactic acid builds up and that's why it starts to burn.
Lifting weights = subject builds muscles = predicate
Lactic acid
it builds muscles and it is good for everyone
Lactic Acid
Lactic acid is formed by anaerobic respiration, and builds up in the muscles.
Canary Islands
exersize, builds muscles, etc.
protien builds your muscles and makes you feel full after eating.
Builds strong bones and muscles.
lactate
The muscles do not have enough oxygen for aerobic respiration.