Jennifer Lopez shows off her gym body in Miami while taking a 10 day diet challenge to cut sugar and carbs. Lopez took a 45 minute personal training session on Thursday morning clutching a bright yellow Hermes Kelly bag. Pictured: Jennifer Lopez Ref: SPL5057865 240119 NON-EXCLUSIVE Picture by: Splash News and Pictures Los Angeles: 310-821-2666 New York: 212-619-2666 London: 0207 644 7656 Milan: 02 4399 8577 World Rights

This week, 49-year-old Jennifer Lopez and 43-year-old Alex Rodriguez launched a fitness challenge : they went on a diet, refusing sugar and carbohydrates, and concentrated on classes in the gym. The singer and her lover decided to stick with this regime for ten days, calling on friends on social networks to join their struggle for good form. On the fourth day of the challenge, the paparazzi were photographed by J. Law at the door of the gym in Miami.

The singer left the training session in a bright, tight-fitting sports set and with a yellow Hermes bag in her hands. Jennifer hid her eyes behind the sunglasses, but from the expression on her face it was obvious that she was tired.

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Read Also: Jennifer Lopez showed what she looks like without makeup

Diet makes a star slimmer, but the mood does not seem to improve. On Wednesday, Lopez admitted to the social network that she was very hungry.

It turned out to be harder than I thought. When there is no sugar and carbohydrates at all, you feel hungry all the time, but you discover many really good types of snacks for yourself,she shared her feelings.

Jennifer and Alex show on social networks what products help them maintain fitness fitness.