I would look into the classic ECA stack. That being ephedrine, caffeine and aspirin.
I've used this plenty of times because I kinda just enjoy stimulants but any CNS stimulant is going to cause strain on your heart.
It used to be fairly easy to acquire 8mg tabs of ephedrine from canadian pharmacies online, I'm not sure if its as easy anymore. Its legal OTC in many places but its regulated fairly heavily in the US as it can be used to create crystal meth. Plus it got a bad rap because of the extremely high doses contained in some of the earlier fat burning supplements, most notably Hydroxycut version one which I believe killed a few fat people. (I would caution exceeding 100mg/day) However its still available OTC at many local CVS/Walgreens pharmacies upon request in the form of Primatene (25mg ephedrine HCL / 200mg Guafaresin) Beware however, that guafaresin is an expectorant, which can dehydrate you easily, but its useful to be able to just walk into a local store and buy all this.
I think a pretty standard protocol would be:
1 81mg baby aspirin
dosed 2-3 times a day.
*I wouldnt take the aspirin more than once just because taking aspirin on the daily isnt really a smart idea
*I would work up to the dose to assess tolerance
*Try not to take it within a few hours of bedtime
*Beware adding other stimulants along with it, you may be able to handle it but it just piles on your heart. Ive tried adding Yohimbine along with it and I was asking for a heart attack
*Be careful to take in enough calories not to catabolize all your gains with all the stims, you will have reduced appetite and faster metabolism
*If you smoke weed or especially cigarettes be wary as of course it will heavily tax your heart, but the ephedrine (and most stims) opens your airways which can encourage chain smoking because you wont feel smogged up as easily.