1) Antidepressants
2) Amphetamine/methylphenidate (though it's not a pure reinforcement of wanting to excercise)
3) High doses of melatonin (3mg at least, stronger effects at 10mg+) and then staying awake. Also cannabis, or audio/visual brainwave entrainment.
4) I had a kratom customer that was a professional PUA (meaning clients paid him for applied lessons) and he found kratom before hitting the clubs helpful for him and his clients.
5) Cannabis. But it's not really great for doing math or science...
In my experience, Modafinil is great at inducing exercise desire. I also find I'm more creative on Modafinil as well. The best thing though, by far, is how dramatically it improves my social ability, talkativeness, and general social adeptness. I took it before a high-stress, two-hour long, panel-style job interview, and I had the single best two hours of social performance of my life. It is, by far, the most generally positive drug I've ever tried. I take it about 3-4 times a week. It also seems to have corrected my insomnia, strangely enough.
I'd like a drug that makes me obsessed with the activity I'm doing during its consumption. The effect must be temporary and its duration controllable -- e.g. it may depend on the amount of drug consumed.
(The game designer in me wants to come up with a downside to balance out the benefit. I'm not sure what negative effects I'd like this drug to have, but I definitely don't want it to induce burnout afterwards.)
6) A drug which puts you in the state of asking "does what I'm doing make sense?", doing an honest search for an answer., and then putting the answer into effect.
Admittedly, the drug that gives you a pony would be easier, but I think that reflectiveness and executive function have physical bases.
1) Don't know.
2) Amphetamines or ephedrine definitely make you more alert and motivated. But they have many side effects and using them for exercising will probably damage your heart.
3) I discovered that Zolpidem ups my creativity quite a bit. Problem is, it's so sedating that you really have to fight to stay awake. It's a sleeping pill, after all. Also there is a bit of hangover and after reading some papers I'm very skeptical of benzos and Z-drugs like Zolpidem. They seem to increase the risk of infection (actually shown through a double-blind study) a...
I want a drug that's like marijuana but is 1) substantially less potent and 2) doesn't impair memory. The reason for this is that I've noticed that while under the influence of small amounts of marijuana, the "connection-making" circuit in my brain is far more active. Of course, if it's too active then this is an impairment (everything becomes "connected"). But I'd rather have to reject spurious connections than to not have access to potentially insightful connections in the first place.
I strongly recommend anonymity when participating in this thread.
I don't know of anything that could achieve (1), except perhaps a general depressant, which wouldn't be worth it.
For (2), there are a wide variety of stimulants to do this, but most of them have side effects that aren't worth it; and the state where this happens, mania, is not a particularly pleasant one.
For (3), I think that state is because some parts of the brain are shutting off, leaving less interference for the remainder. You may be able to get something like this with marijuana (though...
3) I find that whiskey does the trick for me; acts as both a stimulant and a depressant, particularly when mixed with caffeine. I get my best writing done on it, and my best non-productive speculating done when passing out from it (at which point i'm useless for the grind of writing, but idea-creation goes at full force).
Anecdotal evidence from other writers would confirm this as well. Though I don't know how effective it would be for other art forms.
I've mostly figured out how to turn unrequited love off, but I suspect it won't work for most people (like many similar techniques).
Short version: One of the more common effects of infatuation is a blindness to the person's flaws. Sort of like anosognosia, but for someone else's personality instead of one's own body. To get rid of unwanted unrequited love, force yourself to make a list of the person's significant character flaws. Everyone has them, but they're really hard to notice in a crush.
For me, usually just making the list is enough to turn the fuck-like hurting into something more manageable, but reading it over and over has been necessary in a couple of exceptional cases.
We operate like this: the "overseer process" tells the brain, using blunt instruments like chemicals, that we need to find something to eat, somewhere to sleep or someone to mate with. Then the brain follows orders. Unfortunately the orders we receive from the "overseer" are often wrong, even though they were right in the ancestral environment. It seems the easiest way to improve humans isn't to augment their brains - it's to send them better orders, e.g. using drugs. Here's a list of fantasy brain-affecting drugs that I would find useful, even though they don't seem to do anything complicated except affecting "overseer" chemistry:
1) A drug against unrequited love, aka "infatuation" or 'limerence".
2) A drug that makes you become restless and want to exercise.
3) A drug that puts you in the state of random creativity that you normally experience just before falling asleep.
4) A drug that puts you in the optimal PUA "state".
5) A drug that boosts your feeling of curiosity. Must be great for doing math or science.
Anything else?