We’re ditching sit-ups and crunches to give you seven toning plank variations that’ll work more muscle groups and burn more calories. Plank twice a day to strengthen your core, enhance your posture and get rid of lower back pain.

We’re ditching sit-ups and crunches to give you seven toning plank variations that’ll work more muscle groups and burn more calories. Plank twice a day to strengthen your core, enhance your posture and get rid of lower back pain.

Original article and pictures take https://livestrong.com site