Spinner granularity can be set to 5, 10, or 15 seconds in the
preferences now.

If a time value is entered for an exercise that cannot be shown in the
spinner, then it will automatically show the text edit instead of the
spinner. Changing the value to a valid spinner value will call the
spinner to reappear.

This is optional functionality that you have to enable the pref to get.

Once it is set, you have to tap on a spinner to get it to activate. The
spinner will automatically deactivate when the user stops scrolling.
When the pref is turned off, the behavior should be exactly as it is
now.