Sorry, but all the advice given here has been nonsense. All 100mg of test suspension will do is make you run funny from the soreness.

No anabolic steroid will give you a near-instant aerobic endurance boost (although there are a handful that can increase anaerobic endurance, strength, and aggression with a single dose). The only ones that are really useful for running would be Epo and EQ (as the goal here is to boost your RBC count), but these both take a while to work, as erythropeisis isn't an overnight process.