This tab shows you a riff that you can play in 2nd position in all three octaves. It is based on a minor pentatonic scale. If you play it enough times, it will give you the power to move up and down the harmonica while improvising blues solos. If I had to choose between having these riffs in muscle memory or understanding them, I would choose muscle memory.
I use the above riffs as a starting point for the improvisations in this video:
Check it out and let me know if it is useful – thanks!