One Direction's Zayn Malik recently announced his engagement to Little Mix beauty Perrie Edwards and he has since been putting in the hours at the gym to get into his best shape for the wedding.

While he hasn't given any information on their wedding plans as of yet, the 'Best Song Ever' heartthrob has committed to a training program with a personal fitness coach named Mark Jarvis that will tone and strengthen his body.

Jarvis's manager, Ramzy Khachnik, exclusively told Yahoo! OMG that the engagement was what spurred him on as he's happier than ever and wants to look his best for his new fiancée:

"At first, Zayn wasn’t interested, but now he’s engaged he wants to look his best. He can see how much the others bodies have changed, so he’s really got into it. There’s a big difference in his arms now. The fact that he’s happy and engaged has encouraged him to train and look better."

Khachnik added that he can't believe the hysteria surrounding the happy news and it's quite intimidating to see: "Perrie’s got to be a strong, secure character to accept that he’s adored by thousands of fans, it isn’t easy for her. [The 1D mania effect] is unbelievably crazy with them. Zayn has changed dramatically."