Molly Sims in Bathing Suit is Ready for "Ski Week"

Most people layer up before hitting the slopes, but not Molly Sims! The 48-year-old supermodel stripped down into her swimsuit and celebrated the winter weather on Wednesday. "Ski week I'm coming for you ❄️," she captioned the image of herself on Instagram, showcasing her fabulous figure. How does the model and presenter manage to look half her age? Read on to learn 10 of Molly Sims' top tips for staying in shape and the photos that prove they work—and to get beach-ready yourself, don't miss these essential 30 Best-Ever Celebrity Bathing Suit Photos!

Molly refuses to follow a strict diet diet. "It's more about living healthy and how you're feeling," she told Women's Health. "I truly, truly don't like the word 'diet.' I don't even like the scale. I use a pair of jeans; the jeans don't lie I can tell you that." There is a constellation of factors playing in a role in your body's ability to lose weight, and, when you've taken control and made the right decisions, you'll find that you're body—at least when it comes to fat—gets really, really good at telling you when it needs to lose weight.

If you want a body like Molly, you are going to have to work for it. "This does not come naturally," she told Shape. "I have to work out 60 to 90 minutes at least five days a week and stick to a high-fiber, low-calorie eating plan." Good call on the fiber. Fiber lowers the glycemic index (GI) of foods, meaning the rate at which they're turned into toxic blood sugar. In fact, the very same review discovered that habitual intake of fiber from whole grains reduced the risk of coronary heart disease by 20 to 40 percent, and the risk of diabetes by 20 to 30 percent.  And "eat more fiber" doesn't mean you're going to be nibbling on rabbit food. Fiber comes from a number of delicious sources: whole grains, vegetables, fruits, beans, and nuts. A plate of bean nachos, a cup of chili, a steak salad, some guacamole and chips are all high-fiber options. 

Molly attributes her physique to HIIT-style workouts, which she claims majorly changed her body after doing years of intense cardio. "I used to be that girl who wouldn't pick up the 2-lb weights at SoulCycle with the fear that I'd bulk. That mentality has shifted drastically," she wrote on her blog. When you do shorter, high-intensity workouts, you quickly burn off the stored sugar in your muscles, causing your body to melt down fat in order to replace the missing glycogen.

Molly swears by this 20-minute workout shared on her Instagram account. "On good days, workout. On bad days, workout harder," she captioned it. "Today's circuit is what I do when I just have 20 minutes with @lauralizkeller [Sims' personal trainer] to get it in and still break a sweat!" During the clip she does 45 second intervals of the following, with the entire set repeated two to three times: jumping jacks, modified pushups, tricep dips, squat jumps, leg raises, burpees, abd  lateral bend and hold – using ankle and wrist weights the entire time.

Molly is a fan of intermittent fasting. She eats her first meal, usually a smoothie with blueberries, almond milk, Vital Proteins protein, and greens, at noon, and makes sure to finish her last meal of the day by 7 p.m. "Intermittent fasting is safe for many people, but it's not for everyone. Skipping meals may not be the best way to manage your weight if you're pregnant or breast-feeding. If you have kidney stones, gastroesophageal reflux, diabetes or other medical problems, talk with your doctor before starting intermittent fasting," says the Mayo Clinic.

Molly avoids sugar and instead loads up on mostly veggies, lean proteins, and fruits. "I tend to stay away from anything super sugary, like orange juice grapefruit juice, because it really spikes me," she told  Women's Health. "I try to stay away from dried fruits; it's ultimately full of sugar." Added sugar actually blocks the body's ability to synthesize protein into muscle. (Spending big bucks on protein supplements? If they have added sugar, they're probably hurting, not enhancing, your ability to build lean muscle.) By reducing the impact of sugar, you will keep your muscles younger and stronger.

Molly isn't gluten-free, but keeps her intake to a minimum. "It's not that I'm celiac; I just feel better when I have less of it," she told Women's Health. "I don't care if I'm being rude to the rest of the table," she added to Shape about how she immediately orders a salad when she sits down at the table in order to keep herself from nibbling on carbs. "I just do it. Then I'm not tempted to reach for that bread."

Healthy fats are a big part of Molly's diet. "I would have never eaten an avocado 10 years ago if you paid me," she told Health. "Like, are you joking? But now, instead of binging [and] not eating all day, eat it and then you won't binge." Avocados are fill of oleic acid (OEA), also known as Omega-9—it's the primary monounsaturated fat found in olive oil, but it's also found in sunflower oil, grapeseed oil, and sesame oil. Oleic acid can help reduce appetite and promote weight loss. Studies have shown that a higher intake of monounsaturated fat may raise the "good" high-density lipoprotein (HDL) cholesterol without raising the "bad" low-density lipoprotein (LDL) cholesterol. It's also been found to enhance uptake of essential fat-burning nutrients compared to other oils while down-regulating expression of certain fat genes. Additionally, research out of the University of California, Irvine, found that this particular type of fat boosts memory.

Molly rewards herself as an incentive to reach her diet and fitness goals. For example, she will set a goal like "I'm going to get up every morning at 6:30 to work out," she told Shape. "Then, when I've kept with it all week, I give myself something I really want, like a new handbag or a piece of jewelry I'm coveting."

Molly is a big fan of the buddy system when it comes to workouts. "My mom was on my daddy to exercise all the time," she told Shape. "She was like, 'Listen buddy, if I'm doing this, you're doing it too.' and I agree!" She and her husband often coordinate their sweat sessions to keep each other accountable.