J.K. Simmons has been hitting the gym. The 61-year-old actor has seriously bulked up over the past few months, training with fitness pro and former Marine Aaron Williamson. Williamson shared some shots of the now-bearded actor's workouts on Instagram recently, and Simmons looks well and truly pumped. While he's always had a slim frame, it's clear he's gained serious muscle his cut arms and shoulders. "Every time we train together I forget he's 61 years old."Williamson wrote. "So much respect for this guy." Another trainer John Meadows gave Simmons the nickname "#OldManCranking." "He's making me look bad," Williamson wrote in another post,...