When it comes to achieving a strong and toned core, exercises with weights are key. While traditional ab routines can be effective, adding resistance with weights takes your workout to the next level.

If you can plank, crunch, and twist like a champ ... To get the most out of weighted ab workouts, experiment with dumbbells, ...

This week: weighted crunches. If you’ve been doing the same circuit of ab exercises every week for months on end, your workout probably needs a makeover. And how about adding weights to some of ...