Another possibility, how about using an online translator every day to just learn one sentence per day? What about watching a movie that you know and enjoy, but switching to foreign language sub-titles? The possibilities are limitless. Your mind simply cannot help but learn the language, without you even trying or making any conscious effort to do so. I taught myself how to speak German in three months simply by printing sheets with essential words and grammatical formations and taking them into the sauna with me during my daily visit to the gym. Whilst I sweated it out, I used those few moments to teach myself German. Sure, I occasionally got a few inquisitive looks from others, but who cares? I knew what I wanted to achieve and set out to achieve it in the few 'Micro-moments' during my day when I really have nothing else to do or occupy my mind, so I really don’t give a monkeys ass about what anyone else thinks. This is the essence of Microtasking, knowing what you want and being just a little brave in going out to get it, without significantly disturbing the regular pattern of your life.
Suddenly, you find that your Microtasks have become Macrotasks with Macro level results. The only stipulation or 'rule' that should be applied for successful Microtasking is that you should be consistent. Whatever you decide you want to apply Microtasking to, you should ensure that you Microtask on that goal or subject regularly and consistently. Only then do you see the BIG result of all the Micortasks accumulated together. Clearly, just carrying out individual Microtasks once in a while, will bear no real tangible results. This is why, in particular, Microtasking is best applied to activities that are already regularly present in your life and have reached a steady state whereby they are quite constant and unchanging. Examples as mentioned above are, languages, where you've reached a certain level to communicate enough to get by, but you can't really jump to the next level; or eating habits, whereby you are settled in your eating behavior but you want to make a change for the better; or smoking, whereby you have reached a steady state of cigarettes that you smoke per day and want to instigate a reduction in how much you smoke, and so on. It is a little like a train heading on one track towards the wrong station. The train is going one way and the only way to make a change in its direction will be to very slightly move the tracks, so that over the long journey, the train eventually arrives at the right station. You cannot change the momentum of the train, nor can you just switch it to a completely different track or direction all of a sudden. It will crash if you do this. So you gently steer it in the right direction and over time, it follows the correct path with little change in speed or momentum.
Also you should only apply Microtasks to the number of 'Goals' that you can manage. There is no point in 'Microtasking' everything. If you do this, all the Microtasks become one big 'Macrotask' and are thus rendered ineffective. Plus, you need time for yourself and to live your life freely. Microtasking is simply filling gaps that you can afford to fill and not meant as a complete take-over of your life. This should nevertheless, not be a 'get-out clause'. Decide to 'Microtask' a limited number of aspects of your life, but do stick with the plan you made for yourself once you have started!