Action

Not applicable. Tumbling is part of movement, so a Tumble check is part of a move action.

Try again

Usually no. An audience, once it has judged a tumbler as an uninteresting performer, is not receptive to repeat performances. You can try to reduce damage from a fall as an instant reaction only once per fall.

Special

If you have 5 or more ranks in Tumble, you gain a +3 dodge bonus to AC when fighting defensively instead of the usual +2 dodge bonus to AC (see Fighting Defensively, page 140).

If you have 5 or more ranks in Tumble, you gain a +6 dodge bonus to AC when executing the total defense standard action instead of the usual +4 dodge bonus to AC (see Total Defense, page 142).

If you have the Acrobatic feat, you get a +2 bonus on Tumble checks.

Synergy

If you have 5 or more ranks in Tumble, you get a +2 bonus on Balance and Jump checks.

If you have 5 or more ranks in Jump, you get a +2 bonus on Tumble checks.