HOW TO DO IT: Step to your left and lower your body into a lateral lunge, placing both hands on the floor. Without moving your feet, lift your hands and hips and shift your weight over your right foot, so you end up in a right-side lunge. Alternate back and forth for 30 to 60 seconds. To really kick up the burn, turn this movement into a monkey shuffle by simultaneously loading your hands, lifting your hips and shuffling your feet side-to-side between right and left lunge positions.
Exercise has long been correlated with a longer life, but it’s only recently started to become clear why this might be. Studies, like a new one in the journal Preventive Medicine which found that exercise is linked to longer caps at the ends of chromosomes, have helped flesh this out a bit more. These caps, called telomeres, naturally shorten as we age, with each cell division. People who live a long time have telomeres that are in better shape than those who don’t—but there’s a lot we can do to affect the rate at which they shorten over the years. The team behind the new study looked at data from CDC's National Health and Nutrition Examination Survey, and found that for people who exercised regularly, their telomeres were 140 base pairs longer on average than sedentary people's. Which correlates to being years “younger” than their sedentary peers.

Not feeling up to heavy lifting? Try doing more reps at a lower weight instead and you’ll be kissing that arm fat goodbye in no time. Researchers at Canada’s McMaster University studied a group of 20-something men over a 12-week period, with half the study subjects lifting heavy weight and doing low reps, and another group lifting lighter weights for higher reps. The Journal of Applied Physiology study found that both groups increased their strength and muscle size by approximately the same amount, so if you’re relatively new to lifting or don’t feel up to hitting the heavy weights just yet, don’t worry; lighter lifts will still help you ditch the fat while gaining muscle tone.


Harrison is also a hardcore burpee devotee. "It's a full-body exercise that will get your heart rate up, and it can be progressed and regressed in a variety of ways," she explains. (Psst—here are nine ways to do a burpee, no matter what your level is.) But her go-to burpee has a twist: "I also really love mountain climbers for some of the same reasons, so why not combine them?" The combo of the two will skyrocket your heart rate for a major cardio challenge.
The workout below, created by Jess Sims, NASM-certified personal trainer and instructor at Classpass Live, Shadowbox, and Fhitting Room in New York City, challenges your entire body and doesn't require a single piece of equipment. "It’s a full-body, dynamic workout that includes strength, power, mobility, and cardio," Sims says. "It’s also great because it’s customizable—if you have less than 20 minutes, you can do the circuit one time, or if you have more than 20 minutes you can do it three times."
It’s happened to the best of us: We gear up, cue up a killer cycling routine, and head straight for the gym— only to find out it’s temporarily closed (curse you, maintenance!). With heavy hearts and glutes dying to feel the burn, we sullenly make our way back home. At this point, you may be tempted to give up for the remainder of the day, but don’t change out of your gym clothes just yet! You already have the only workout machine you need on you.
When she's working out sans equipment, Marraccini's favorite exercises are all things core-related. "A strong core never goes out of style," says Marraccini. This makes sense, considering that having a strong and stable core is essential for both everyday movements as well as exercising. While regular crunches really only target the upper portion of your abdominals, runner's crunches work your entire core as you sit all the way up, including your obliques, lower back, hip flexor muscles, and rectus abdominis (which is what you probably think of when you think "six-pack" muscles).
Reduce your consumption of carbs, sugars, and animal fats. Consuming foods high in carbs and sugars will cause your body to secrete insulin, which is a main fat storage hormone in your body. When your insulin levels drop, this allows your body to burn fat. Lower insulin levels also help your kidneys shed excess sodium and water, which will help you reduce any water weight you are carrying.[10]

Get 7-9 hours of sleep each night. Sleep is a crucial component of fat loss and muscle building, which happens most effectively when your energy consumption is lowered. Aim to get between 7-9 hours of sleep each night by establishing a sleep routine to follow, including a 60-90 minute period to wind down before bed. During this time, shut off your phone and do something relaxing, like reading or meditation.[11]
Pushups are a challenging bodyweight exercise that develops the triceps, shoulders and core. Aim to do as many pushups as you can in one session for a total of two to three sets with rest in between. You can modify a full pushup position by starting on your knees rather than your toes. Do pushups by lying face-down on the floor. Prop yourself up so that you are on your hands and knees, with your body forming a straight line from head to toe. Your hands should be underneath your shoulders. Keep your abdominals engaged as you lower toward the ground and push back up into start position.
10. It enhances emotional well-being. Most people report that they feel calm and have a sense of well-being after they exercise. Exercise, according to one theory, releases beta-endorphin, a natural substance in the body that is hundreds of times more potent than morphine. Another theory points to serotonin as the cause of the exercise high. Increased levels of serotonin in the central nervous system are associated with feelings of well-being, heightening of appetite, and lessening of mental depression. The weight loss that accompanies exercise can also cause people to feel better about themselves.

Lie on your back with the knees bent and feet flat on the floor, approximately hip-width distance apart. Lift the left leg up so that the leg is straight and the thighs are parallel. As you exhale, keep the core engaged and lift the hips off the floor. Hold for one to two seconds, and slowly lower down to starting position. Complete 10 to 12 reps on the right side before switching to the left.
You'll also build muscle to fill out your arms and firm them up. “Generally, when people are complaining about underarm jiggle, they’re usually referring to the area that is governed by the tricep,” says Williams. “If the jiggle or looseness in that part of your arm is due to a lack of muscle, then strengthening and building muscle in your tricep will also create some change in the aesthetic of that area.” She recommends performing triceps push-ups, extensions, and dips to hone in on that area and add some muscular definition to your arms.

Quick Q&A: Which is better at relieving anxiety — a warm bubble bath or a 20-minute jog? You might be surprised at the answer. The warm and fuzzy chemicals that are released during and after exercise can help people with anxiety disorders calm down. Hopping on the track or treadmill for some moderate-to-high intensity aerobic exercise (intervals, anyone?) can reduce anxiety sensitivity Effects of aerobic exercise on anxiety sensitivity. Broman-Fulks JJ, Berman ME, Rabian BA, Webster MJ. Department of Psychology, The University of Southern Mississippi, Hattiesburg, MS, USA. Behavior Research and Therapy. 2004 February;42(2):125-36. Exercise for the treatment of depression and anxiety. Carek PJ, Laibstain SE, Carek SM. Department of Family Medicine, Medical University of South Carolina, Charleston, SC, USA. The International Journal of Psychiatry in Medicine. 2011;41(1):15-28.. And we thought intervals were just a good way to burn calories!
Those buff lab rats might be smarter than we think. Various studies on mice and men have shown that cardiovascular exercise can create new brain cells (aka neurogenesis) and improve overall brain performance Aerobic exercise is the critical variable in an enriched environment that increases hippocampal neurogenesis and water maze learning in male C57BL/6J mice. Mustroph ML, Chen S, Desai SC, Cay EB, DeYoung EK, Rhodes JS. Neuroscience Program, The Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, USA. Neuroscience. 2012 September 6;219:62-71. Aerobic exercise improves hippocampal function and increases BDNF in the serum of young adult males. Griffin EW, Mullally S, Foley C, Warmington SA, O’Mara SM, Kelly AM. Department of Physiology, School of Medicine, University of Dublin, Trinity College, Dublin, Ireland. Physiology & Behavior. 2011 October 24;104(5):934-41.. Ready to apply for a Nobel Prize? Studies suggest that a tough workout increases levels of a brain-derived protein (known as BDNF) in the body, believed to help with decision making, higher thinking, and learning. Smarty (spandex) pants, indeed.
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