There is truth in the saying -- You must work hard to achieve success.
But hard work is not to be measured by the number of hours or litres of sweat. Hard work is working against your will, comfort, liking or preferences. Hard work is something that is hard on you. It may demand you to move out of your comfort zone (physical or emotional) on a regular basis. It can alienate you from family, friends, and your loved ones. It can deprive you of certain pleasures in life.
Success can be engineered only if you are ready to put in a lot of hard work unconditionally.