It's enormously satisfying to choose a group of metrics over which you'd like to develop Mastery and see your ability to exercise control improve steadily with practice.
The three groups of metrics in which you can pursue that kind of control are
Time and SPL
Time and Tempo
Tempo and SPL
They're all related, but the experience I have in each is quite distinct.
It feels great to keep one metric constant while improving the other -- e.g. SPL constant, time improving.
It feels every better when you can improve both metrics at once, as you did in reps 1-4 in your final set.
I'll post my examples from the two post-Nationals practices I've done this week in a thread by that name.
Head Coach & Chief Executive Optimist
May your laps be as happy as mine.
My TI Story