It is not easy being a Victoria Secret Model, especially when it's time to get runway ready. The Angels, as the Victoria Secret models are popularly called, have to adhere to a strict routine, which is not meant for the faint-hearted. To become the Victoria Secret model, a girl commits to a daily job that makes her sweat. It demands that she eats in small portions and only clean, healthy food.

Justin Gelband is a personal trainer and Mary Helen Bowers is a former professional ballerina. These two ensure that some of the well-known, Victoria Secret models -- such as Karlie Kloss, Erin Heatherton, Lindsay Ellingson, Candice Swanepoel and Lily Aldridge --get in the perfect shape before the big day. Needless to say, these ethereal models look stunning in the little lingerie.

Talking to New York Daily News, Gelband said there is a common perception that Victoria Secret models are "born with a gift." He said that these models may be are more beautiful than an average person, but "that doesn't mean that their bodies don't start at a 4, 6 or 8."

According to the New York Daily News, weeks before they hit the runway, the Victoria Secret models follow a custom program, designed by Gelband. It is six days a week, an hour of gruelling schedule, with no scope for short-cuts and complacency.

Gelband also said that there is an interval training, which includes "high intensity kickboxing," which can be a workout to keep the butt in shape; and "lengthening and strengthening exercises such as Pilates."

Bower organises Ballet Beautiful sessions. New York Daily News reports that these sessions enables "Aldridge and Ellingson to "microsculpt" their muscles, days before the big event on Tuesday night.

Prior to the Victoria Secret November event, Lily Aldridge had said to Hollywood Life that she is doing Ballet Beautiful as "it's very good for your body, and very healthy and fun, so it's my go-to."

"We're tailoring their workouts at the very end based on what their outfits are," said Bowers to New York Daily News. "They're getting their final fittings those last two weeks, so we know how much you're seeing of their stomach and their butt and their legs versus how do they feel when they put the wings on. We're able to micro-sculpt those muscles."