The Yoga of Action.
Karma yoga encourages an active life, all work must not only be
fitting but also performed in the spirit of an inner sacrifice.

It purifies the heart by teaching you to act selflessly,
without thought of gain or reward.

By detaching yourself from the fruits of your actions and offering
them up to God, you learn to sublimate the ego.

To achieve this, it is helpful to keep your mind focused
by repeating a mantra while engaged in any activity.
Karma Yoga