(sigh) You are confusing yourself again.
"Getting stronger" is always healthy. But eating too much and getting fat is different from getting strong; one does not necessarilynhave to include the other, even if there is frequently some overlap or inclusion. Improving your marathon time is not always healthy, either [it breaks down your joints, teaches your body to run on fat as a fuel, and (research is now showing) causes heart disease - anecdotally see
http://www.active.com/running/Articl...ck_factors.htm ] This is not a productive way to think about the world. It is also a logical fallacy called a "False Dichotomy"
You do not have to become obese and "unhealthy" to get stronger. Do not set that sort of black and white paradigm for yourself.
If your swimming and long slow distance work deteriorated while doing SS that's because you were working different muscles and a differnt energy system. Period. It's not making you sicker or "less fit" or whatever metric you want to use. Its just different.
If running 1500 meters is a priority to you, then intelligently program running 1500 meters into your training schedule. Just do not expect it to have no effect on your strength gains.
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