Building muscle in your abs isn't something that happens overnight. It takes consistency in both your fitness and dietary habits and results will vary from person to person.
That being said, keeping up with a regular practice of the best ab exercises is a starting point and something that will help to form definition in and around this area of muscle.
Thankfully, a good ab workout doesn't necessarily need weights to make it worth your time. Of course, if you own one of the best kettlebells then you might like to incorporate weight into your core training to increase the challenge.
