i used to do mainly breastroke and no rests for my workout a few weeks ago ,since reading many different articles on this forum ,the last couple of weeks have seen a change in my workouts.i now do a warmup of alternate freestyle/breastroke25,50,75 and100m.then i do 20 sets of 125m
(first and last 25m freestyle) the rest (75m) breastroke,i find that my arms are really tired,legs too by the end of these sets(i rest between sets about 20-40 seconds)then i warmdown reverse of warmup.I am hoping to increase the freestyle part but don't know if the tiredness will allow this.(total workout including warmup/down=3000metres,total free=1250,total breastroke=1750metres)is there anything i can do to keep energy levels higher?no drugs though.