Karma Yoga is the path ‘action’, putting in 100% effort and not being attached to the outcome or fruit of the action. Karma yoga can be applied to every task that you do, when the action is done with full focus and attention, yet selflessly, it brings total fulfilment and freedom. Acting without being attached to the fruits of one's deeds – this alone can bring the union with the Self/Being, which is the goal of yoga (the union of the body, mind, spirit).
Thy right is to work only, but never with its fruits; let not the fruits of action be thy motive, nor let thy attachment be to inaction. As the ignorant men act from attachment to action, so should the wise act without attachment, wishing the welfare of the world.
~The Bhagawad Gita