I was a long distance runner up to 6 years ago (1/2 marathons ans 10km). I'm really not sure designer steroids can help you : you wil have pumps, weight gain, maybe accelerated heartbeat and other sides. not good for a runner.
Low Test doses would be really good though, but I believe you don't want to inject ? You can maybe find testosterone gels or patches (enough for you).
IMHO you should :
- take inj B12 along with iron to help raise your hematocrit levels,
- then use supps like for recovery and control acid lactic levels, forslean to raise naturally your Test (up to 40%) , then for .
I really think it's enough, unless you already have a very high level (national or more...).
I forget : I tried syntheselen ("human" version of kynoselen) 5 years ago, and it was very good for and general energy. Not really effective for a BB, but for you I think it would be nice...the bad side is you also have to inject, so...