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Displaying an interval of minutes and recording time

Hi all,

I am working on a design where a user has a workout table based on intervals. As an example the interval structure could look like this:
3 minutes
4 minutes
4 minutes
5 minutes

The session starts when the user clicks a button and I would also like to allow the user to be able to hold a click or keep their hand on their screen to start a timer within that interval and then end it when they let go.

I am struggling with figuring out how to add these intervals into a list in the database. The date itself (mm/dd) is irrelevant and the focus is on the time itself.

Any thoughts on where I can begin?