If you want to win mindfulness & alertness then you should develop that particular development of samadhi;
"And what is the development of concentration that, when developed & pursued, leads to mindfulness & alertness? There is the case where feelings are known to the monk as they arise, known as they persist, known as they subside. Perceptions are known to him as they arise, known as they persist, known as they subside. Thoughts are known to him as they arise, known as they persist, known as they subside. This is the development of concentration that, when developed & pursued, leads to mindfulness & alertness.
If you do this you might or might not be rewarded with mindfulness & alertness and or a pleasant abiding, it will depending on how skillful you are in taking note of your mind and adjusting [directing] which will depend on learning.