Thanks for your question
Firstly, Are you still going to the gym and what is your training program, day by day? Also what is your current diet? Basic muscle physiology is, that by training a muscle with moderate to heavy loading the muscle will respond and adapt by increasing in size and strength.
Generally speaking, If you were looking to reduce ‘muscle mass’ you would limit the heavy strength training you were performing and look to substitute that with lighter resistance exercises that were more specific to longer distance running. You would also increase the repitions to above 20odd to focus on muscular endurance and fatigue, to change the physiological properties of the muscle, in order to mimic the stress that longer distance running places on the body.
Combining this with more cardiovascular training which is again specific to longer distance running should see you reducing your muscle mass and bulk and becoming more lean and thus more suited to half and full marathons.
An accredited exercise physiologist (AEP) would be perferct for you to consult in regards to your question for a full assessment, eating and exercise plan specific to your needs. To find your nearest AEP log onto http://www.essa.org.au and simply type in your suburb into the “Find an exercise physiologist” box at the top of the home page.
Thanks and all the best
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