Bicep training doesn’t have to be boring or repetitive.
Many lifters stick to the same three or four curl variations for years, wondering why their arms have stopped growing.
But what if there was a simple framework that could unlock dozens of effective curl variations—keeping workouts fresh, joints healthy, and biceps growing?
Fitness expert Dr. Mike Israetel recently broke down a comprehensive “codex of curls” that transforms how lifters approach arm training, offering a strategic system to create endless variation without sacrificing effectiveness.
Jump to:
- The Four-Category Framework for Unlimited Curl Variations
- Category One: Implements—Your Tools for Growth
- Category Two: Angles—Changing Body Position for Maximum Effect
- Category Three: Bilateral Versus Unilateral Execution
- Category Four: Grips—The Often-Overlooked Game Changer
- Implementing the System: Building Your Perfect Curl Rotation
- Not All Curls Are Created Equal: Biomechanical Optimization
- The Bottom Line on Bicep Training Variety
The Four-Category Framework for Unlimited Curl Variations
Dr. Israetel’s system organizes every possible curl into four distinct categories: implements, angles, bilateral versus unilateral execution, and grips.
By selecting one option from each category, lifters can construct numerous curl variations tailored to their needs, preferences, and training phase.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
By recombining these, you are going to be able to come up with, use, and grow from dozens and dozens and dozens of different kinds of curls, which means for you the variation for curls will never end, and you will be able to have amazing consistent training, and your biceps will be massive.
This combinatorial approach eliminates training staleness while ensuring continuous progress.
Category One: Implements—Your Tools for Growth
Implements refer to the equipment used during curls. According to Dr. Israetel, there are six primary implement categories:
- Barbell curls: Classic mass-builder allowing heavy loading
- EZ-bar curls: Reduced wrist strain with angled grip
- Dumbbell curls: Maximum freedom of movement and unilateral options
- Cable curls: Constant tension throughout range of motion
- Dual cable curls: Unique ability to position arms behind body for enhanced stretch
- Curl machines: Stable, controlled movements ideal for isolation
Each implement offers distinct advantages, and selecting among them provides immediate variation.
Category Two: Angles—Changing Body Position for Maximum Effect
Body positioning dramatically alters muscle tension and growth stimulus. Dr. Israetel identifies several angle options:
- Forward lean: Spider curls emphasize peak contraction
- Upright posture: Standing or seated, both count as variation
- Incline positions: Multiple incline angles available for progressive stretch
- Lying curls: Horizontal positioning increases stretch tension
- Decline curls: Ultimate stretch position, though unconventional
Nearly all implements can be combined with these angles, multiplying available variations exponentially.
Almost all of these can be done with some combination of dumbbells, barbells, easy bars, machines, cables, you name it. So, it turns out that the angles multiply into the implements.
Category Three: Bilateral Versus Unilateral Execution
Choosing between training both arms simultaneously or one at a time creates another layer of variation.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
Bilateral training (both arms together) offers time efficiency and greater stability, making it easier to handle heavier loads.
Unilateral training (one arm at a time) provides enhanced mind-muscle connection and potentially greater force production per arm, though requiring more training time.
Neither approach is universally superior—both have strategic applications depending on training goals and individual response.
Category Four: Grips—The Often-Overlooked Game Changer
Grip position fundamentally changes which muscles receive emphasis during curls.
Underhand Grip
The traditional supinated position directly targets biceps with maximal activation.
Supinating Grip
Starting neutral and rotating to fully supinated at the top adds resistance to the biceps’ supination function.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
If you grab on the outsides of dumbbells, that weights the inside of the dumbbell more and allows you to do resisted supination, which can make for an awesome bicep exercise.
This technique works exceptionally well with dumbbells and certain cable attachments.
Neutral Grip (Hammer Curls)
Palms facing each other shifts emphasis toward brachialis and forearm muscles.
Overhand Grip (Reverse Curls)
Pronated grip reduces biceps involvement but heavily targets forearm flexors and extensors for complete arm development.
Implementing the System: Building Your Perfect Curl Rotation
Using this framework is straightforward: select one variable from each category and verify the combination is biomechanically sound.
For example, choosing barbell + standing upright + bilateral + underhand grip creates the classic barbell curl. Selecting dumbbells + low incline + bilateral + supinating grip produces incline dumbbell curls with rotation.
Dr. Israetel recommends selecting two to four curl variations per training block (typically four to eight weeks), keeping exercises that produce results while replacing those that don’t.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
Choose two to four of them to do in any given microcycle for any given number of four to eight week meso cycle lengths. Keep in what you like at the end of the meso, delete what you don’t like, replace it with a new exercise that you’ve made from these four categories.
Not All Curls Are Created Equal: Biomechanical Optimization
While variation prevents staleness, certain curl types consistently deliver superior results based on biomechanical principles.
Stretch-Position Curls Reign Supreme
Exercises emphasizing biceps stretch under tension typically produce the best hypertrophy results:
- Behind-the-back dual cable curls
- Low incline dumbbell curls
- Lying curls
- Decline curls
Typically the most effective curls are the ones that put the biceps at a stretch. Those punch way above their weight. They look a little silly, but they work super super super well.
Forward-Lean Positions May Be Less Effective
Spider curls and similar forward-leaning variations emphasize peak contraction rather than stretched position, potentially making them less efficient for muscle growth compared to stretch-focused alternatives.
Hammer Curls: Potentially Redundant
While hammer curls aren’t ineffective, Dr. Israetel notes they may be redundant for most lifters.
Back training—rows, pull-ups, and pulldowns—already trains forearm and upper arm musculature in neutral grip positions extensively.
Hammer curls are often redundant in a program because it’s just pouring more volume on the muscles that are already getting a ton of it from back training and missing out on direct bicep stimulus.
Prioritizing underhand and supinating grips typically provides more targeted biceps development.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
The Bottom Line on Bicep Training Variety
Effective bicep training doesn’t require constantly inventing new exercises or chasing novelty.
Instead, understanding the four fundamental categories—implements, angles, bilateral versus unilateral execution, and grips—empowers lifters to systematically create dozens of effective variations.
Prioritize curls emphasizing stretch positions for maximum hypertrophy, rotate exercises every training block to prevent staleness and joint stress, and favor underhand or supinating grips for targeted biceps development.
With this framework, running out of effective curl variations becomes virtually impossible—and biceps growth becomes inevitable.
