Jennifer Lopez is flaunting her impressive abs with sultry selfies. The 56-year-old entertainer posted pics of herself during an early morning workout Sunday, wearing a cropped long-sleeved top, glittery black leggings that she rolled down to show her hips, and white sneakers. Lopez struck a pose in the mirror to show off her washboard abs, which her outfit highlighted to perfection. She captioned the pics with a flexed biceps emoji, and also wrote on her Instagram Stories of the pics, “Rise and grind.” Jennifer Lopez showed off her impressive abs on Instagram Sunday. Instagram/@jlo The singer, 56, glistened after an early morning workout. Instagram/@jlo The “Let’s Get Loud” singer got plenty of support in the comments section, including from celeb fitness expert Tracy Anderson, who wrote, “Those abs!!! 💕💕💕.” Another comment reads, “Pure discipline. Timeless inspiration. ❤️.” Last month, Lopez said she was “happy” and “free” following her divorce from Ben Affleck, 53.…