If you are looking to increase your muscular endurance you should be lifting lighter weights for more reps (12+) (Baechle & Earle, 2019). If you are looking to lose fat, then you are looking to lift light to mid weight for higher reps (10-15) (Tuminello, 2014).
Both heavy and light weights can be effective for fat loss when combined with high repetitions and adequate volume. Heavy weights stimulate muscle growth and metabolism, while light weights with higher repetitions promote muscular endurance and calorie burning.
That plan is called the 30-30-30 rule. It's a simple but catchy idea that encourages you to eat 30 grams of protein within 30 minutes of waking up and then get 30 minutes of low-intensity exercise. The 30-30-30 rule now has millions of followers on TikTok.
For Fat Loss and General Fitness: Aim for 2-4 sets of 10-15 repetitions It's important to choose a weight or resistance level that challenges you within this rep range. Rest: 30-60 seconds between sets.
If you are looking to increase your muscular endurance you should be lifting lighter weights for more reps (12+) (Baechle & Earle, 2019). If you are looking to lose fat, then you are looking to lift light to mid weight for higher reps (10-15) (Tuminello, 2014).
Activities like running, cycling, and high-intensity interval training (HIIT) burn more calories and fat throughout the body, including the upper belly, lower belly, and obliques. So, while ab exercises can help define your core, it's a holistic approach that will help you lose the fat covering those muscles.
For weight loss, research has found that that lifting between 60-80% of your 1 rep max (the heaviest amount of weight you can lift for one repetition of an exercise) is the best way to stimulate muscle growth, which is what helps you lose fat by burning more calories.
This is where following the 40/30/30 rule comes in—and don't worry, it's pretty straightforward: “The idea is to aim for 40 percent carbohydrates, 30 percent protein, and 30 percent fat per meal,” Quintero says. “It's based on an ideal balance of macronutrients.”
To lose 30 lbs at a healthy pace of 1 to 2 lbs per week, you must either reduce your calorie intake or increase your energy expenditure to generate a calorie deficit. This amounts to a 500-calorie loss for 1 lb and a 1,000-calorie deficit for 2 lbs.
Brecka claims that the 30-30-30 rule helps the body burn fat without losing muscle, and results can be seen in as little as one month.
And if you want to lose weight, both heavy lifting and lighter lifting can help you burn fat. And let's not forget that you don't even need weights at all to build strength.
The amount of weight you use determines the type of muscle you'll build. Heavier weights enhances the amount of muscle-growth hormones released and the amount of fat-burning hormones. While light weights help burn off fat and toning muscle, heavier weights help build them.
Fact: Heavy weights build strength, which helps you maintain muscle while losing fat. Lifting heavy weights with low reps won't help you lose much weight, but it will help you maintain hard-earned muscle while losing fat. High reps (12 or more reps per set) build muscular endurance but don't really build strength.
Significant weight loss and muscle gains will take approximately eight weeks to see, however, even though you're not seeing muscle definition, the benefits going on in your body and mind are considerable. “Your clothes will fit better, your posture will be better and you'll walk taller,” Sharp says.
The Science of Fat Loss
Think of it like a balloon losing air—it deflates, but doesn't disappear immediately. Over time, your body adjusts, but the jiggly feeling can be a temporary step along the way.
If you do cardio first, you will deplete some of that glycogen, decreasing your energy. And that will make weight lifting more challenging.” Cardio relies on a mix of glycogen and fat for fuel, he added. You burn glycogen when you lift weights, so if you do cardio afterward, your body has to burn more fat for fuel.
Studies have shown that you can help trim visceral fat or prevent its growth with both aerobic activity (such as brisk walking) and strength training (exercising with weights). Spot exercises, such as sit-ups, can tighten abdominal muscles but won't get at visceral fat. Exercise can also help keep fat from coming back.