So, in general, low reps with heavy weight tends to increase muscle mass, while high reps with light weight increases muscle endurance. This doesn't mean that you have to rely on one method exclusively. Alternating between the two may be the best approach for long-term success.
If you're looking to gain muscle, and increase your strength in the most efficient way possible, then lifting heavy weights is a good option for you. Gaining strength all comes down to fatiguing your muscles, and heavy weights will get you there faster.
It is possible to build muscle with light weights as long as you do an adequate amount of volume, train frequently enough, eat enough calories (especially protein), and always use proper form. Slowing down your lifts and increasing your time under tension is another excellent way to build muscle with light weights.
You should aim to lift weight, also known as resistance, that's heavy enough to challenge yourself. A good guide is to select a weight that tires your muscles after 12 to 15 repetitions, or reps. When you find that weights feel too easy, try gradually increasing the weight to the next level up.
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. It's even better when you use explosive movements.
Generally, exercises with higher reps are used to improve muscular endurance, while higher weights with fewer reps are used to increase muscle size and strength.
High reps build muscle and connective tissue strength, and give your body respite from the grind of low-rep sets, too. Similarly, low-rep sets build neuromuscular and CNS efficiency.
It is a myth that one must lift more weight to bulk up. If you're regular and patient with lighter weights, you can achieve similar results. It all comes down to two factors: the number of reps, and the way you perform them in order to achieve muscle fatigue.
You Don't Have Enough Training Volume
The more volume in your training (more sets and reps) the greater the hypertrophy response you will get (up to a point of course). If you like to stick to powerlifting specific programming this may very well be the reason you aren't seeing much progress in terms of muscle growth.
Better Range Of Motion
Lighter loads allow for the exercise to be performed through the full range of motion. Lifting heavier weights tends to shorten the range of motion, not fully taking advantage of the intended movement.
Use the "2 for 2" rule when deciding if it's time to increase the amount of weight you're lifting: When you can do two more reps with a given weight than you started out with for two consecutive workouts, increase the weight.
Most beginners will see noticeable muscle growth within eight weeks, while more experienced lifters will see changes in three to four weeks. Most individuals gain one to two pounds of lean muscle per month with the right strength training and nutrition plan.
similarly, heavy weight lifting refers to training with heavier weights than usual. Anything heavier than 200 pounds for upper body exercises is considered heavy. For most people, anything over 300 pounds for lower body exercises is considered heavy. The most a person can lift is known as their one repetition maximum.
More repetitions with lighter weights can build muscle as well as heavier weights -- assuming they are done to the point of exercise-induced fatigue.
A wide variety of reps can help build lean muscles. There are many rep ranges that can help you build lean muscles. Some organizations, such as the American College of Sports Medicine, believe that the ideal rep range for mass is six to 12, but it's possible to build muscle using a very wide range of repetitions.
If you're looking for home workouts without equipment, but worried about the results, we've got good news: It is possible to build muscle without weights. In fact, all bodyweight exercises can be just as challenging (and effective) as a pullup.
For long-term bodybuilding, you'll eventually incorporate heavier training using lower repetitions and near-maximum weights. The purpose of heavier training in bodybuilding is to improve strength that eventually allows more high repetition training using heavier weights.
It is made clear through all of these studies that resistance training done with high reps needs to be accompanied with high intensity (training to failure). If done, high reps can produce significant improvements in lean muscle mass, strength, fitness, body composition, and bone mineral density.
So, How Many Reps to Build Muscle? Doing around 6–20 reps per set is usually best for building muscle, with some experts going as wide as 5–30 or even 4–40 reps per set. For bigger lifts, 6–10 reps often works best. For smaller lifts, 12–20 reps often works better.
You're not eating enough – one of the main causes of not being able to build muscle is not eating enough and more importantly, not eating enough of the right food. Everyone bangs on about the importance of protein, but carbs and fats are just as important when it comes to growing muscle.
Downtime between workouts (whether you're lifting, doing cardio or training for a sport) is when our bodies have a chance to actually build muscle. Strenuous workouts cause muscle breakdown, while rest allows our bodies to build it back up.
Reps for muscle growth
In order to get bigger and stronger, you must ensure your muscles work harder than they are used to. Generally, between 6-12 reps for 3-6 sets will help to build overall muscle size.
Do more with less – adopt a routine of more reps with lighter weights. You don't need to work with very heavy weights to develop lean, toned muscle. For example, two sets of bicep curls with a 5 or 8 pound weight will help you tone without bulking up.