Hot answers tagged long-distance-running
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Your question is in some ways quite broad, but in the narrow sense: yes, long distance slow paced steady-state cardio like marathon running absolutely reduces muscle mass, and has a distinctly diminished return on investment after you've been doing it for a while. That is, if you work yourself up to running X miles every week, staying at X miles each week ...
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Given the above regimen, another sprint workout is the last thing I recommend. On that schedule, in your two sessions you are doing at most, 5 miles (8k). That is pretty meager training for the distances that you are considering.
I would make your third run a slow to medium paced 10k run. Running long distance fast is about your base and consistency, and ...
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As k.l. says, having a six pack is a function of both muscle structure and body fat levels. The "six pack", or 4, or 7 or 8 (etc) is basically just the abdominal muscles, with the connecting/support fascia making the indentations. (I say the other numbers as you have no control over how many divisions your fascia makes, it's genetic. I've even seen one guy ...
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So, to the extant that endurance training makes you lose muscle mass, it will likely be noticeable as its happening. If you WANTED to do distance running, it might make sense to combine it with a basic strength workout once or twice a week. That way, as you lose strength, at least you'll be able to see it happening, and track its progress.
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