not to be that person but that is not really serotonin what serotonin is like is hard to describe but i would not call it really pleasurable  these things sound more like endorphin producing tasks which produce dopamine as a side-effect dopamine is not pleasurable necessarily by itself it is just the enforcement element of it there may be little liking associated with it just doing and wanting to do liking and wanting are two different concepts but for neurotypicals are usually pretty insync   however endorphins are the liking aspect and the body then also releases dopamine with it to say do more of this shit please dopamine is about movement and motivation it came about from directing movement why low dopamine causes shaking trembling or other movement disorders dopamine also directs internal movement or aka motivation  anyway sorry i find this shit interesting and couldnt help myself  i know it really isnt important to the post but i couldnt help myself