My normal practice session goes like this:
8 or 10 shots to line up, loosen up.
a game or two of low ball - 20 being the perfect score.
Or I will do a spare drill - shoot the 10 till I get it, then the 6, then the 3, then the head pin, then the 2, then the 4, then the 7. Perfect score - 7 (one try each)
After the spare drill, the lane becomes 35-40 feet long for a while, when I work on targeting a shot I don't normally play - 5th arrow, twig, whatever I feel like. Sometimes I get real energetic, and play around with lining up in front of the ball return.
While I'm doing the above, or after, I play around with hand positions/releases/follow through changes.
Then, and only then, I bowl a game or two for score. When I'm doing that, I ALWAYS shoot my spares.
And - when I'm practicing, I make sure I stay hydrated - I only drink WATER.
Then I dry off, and go home and take a shower.
I'm working up to around 20 games a day, so that when I bowl the longer format tournaments, the 12-16 a day is a breeze. It's going to take me a couple of months, though - I can barely get through 8 right now. Of course, I often practice aerobically (read "way too fast"), so that cuts down on how long I can go.
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I start each day with yoga and meditation. I put my right foot under my left thigh. I put my left foot under my right thigh. I arch my back as much as I can, and then I begin my mantra: Ouch, oh, that hurts.