Jennifer Lopez and Dwayne Johnson, who have been friends for a long time, decided to spend their evening sweating it out at the gym. Johnson posted a photo on Instagram of the duo looking serious, suggesting that they had probably had a challenging workout. It seems that they were at trainer Gunnar Peterson’s exclusive Beverly Hills gym where Lopez is a regular client. Peterson has helped shape many Hollywood bodies, including those of Sofรญa Vergara, Minka Kelly, and the Kardashians.