Tommy M:
Fuck 'em.

The breath. That's your answer. That's all you need.
Breath counting is ideal, you can do it anywhere and it will boost your concentration if you do it properly. No question.
I like that answer, and I'll second it (based solely on subjective experience).
I used to use a mantra meditation combined with a visualization for twenty years making little progress before I tried the Buddha's simple technique of
anapanasati. Once I understood
anapanasati and how it worked, I began to have almost immediate positive results contacting the pleasantness of the breath.
Visualization techniques, in my humble opinion and experience, have been for me just a red herring, feel-good technique that can tend to misdirect the mind during meditation. Now, I must caution, these are only
my own findings, and as the advertisements say, "results may vary." While visualization may help with developing concentration, if you want to achieve what Gotama achieved (namely, the end of suffering), you have to follow his instruction and advice.
Use visualization at your own discretion. Nothing ventured, nothing gained.
Try breath meditation (become familiar with and learn about
anapanasati first) when all else fails. It's time tested, and "mother nature" approved!