Lying Single-Leg Reverse Biceps Curl with Towel: Forearm Form, Sets, Tips & FAQ
Learn the Lying Single-Leg Reverse Biceps Curl with Towel to strengthen forearms, brachioradialis, grip, and elbow flexion control using bodyweight self-resistance.
Lying Single-Leg Reverse Biceps Curl with Towel
This exercise is useful for athletes, lifters, climbers, combat-sport athletes, and anyone who wants stronger forearms at home. Unlike a standard dumbbell reverse curl, the resistance is not fixed. You control the difficulty by pressing or pulling with the leg while your hands curl the towel. This makes the movement highly adjustable and joint-friendly when performed with smooth technique.
The key is to keep the movement controlled. Your elbows should stay close to your torso, your wrists should remain mostly straight, and your raised leg should create steady tension against the towel. The goal is not to yank the towel aggressively. The goal is to build constant tension through the forearms while maintaining a clean reverse-curl pattern.
Quick Overview
| Body Part | Forearms |
|---|---|
| Primary Muscle | Brachioradialis |
| Secondary Muscle | Wrist extensors, biceps brachii, brachialis, grip muscles, anterior core stabilizers |
| Equipment | Towel and bodyweight leg resistance |
| Difficulty | Beginner to Intermediate |
Sets & Reps (By Goal)
- Forearm endurance: 2–3 sets × 15–20 reps per side with light-to-moderate resistance.
- Muscle growth: 3–4 sets × 10–15 reps with a slow 2–3 second lowering phase.
- Grip strength: 3–5 sets × 8–12 reps while squeezing the towel firmly throughout each rep.
- Warm-up activation: 1–2 sets × 12–15 easy reps before curls, pulling, or grip-heavy training.
- Rehab-style control: 2–3 sets × 8–10 slow reps using very gentle resistance and perfect wrist alignment.
Progression rule: First increase control and time under tension. Then increase leg resistance. Do not progress by jerking harder or pulling the towel explosively.
Setup / Starting Position
- Lie on your back: Rest on a mat or flat surface with your head, shoulders, and hips supported.
- Loop the towel: Place the middle of a towel around the sole of one foot.
- Raise one leg: Lift the towel-looped leg so the towel can create a straight line of tension between your foot and hands.
- Grip the towel ends: Hold one end in each hand using a reverse grip, with palms facing down or slightly inward.
- Set the elbows: Keep your elbows near your sides and slightly in front of your ribs.
- Brace lightly: Keep your ribs down and lower back comfortable. Do not arch hard to create force.
- Create tension: Press gently through the foot as your hands hold the towel. The towel should feel firm before the first rep begins.
If the hamstring feels tight, slightly bend the raised knee. The exercise should challenge the forearms, not force an uncomfortable leg stretch.
Execution (Step-by-Step)
- Start with arms extended: Begin with the elbows mostly straight while keeping light tension on the towel.
- Set your wrist position: Keep the wrists neutral. Avoid bending them backward or letting them collapse forward.
- Curl the towel down: Flex the elbows and pull the towel ends toward your torso using a reverse-curl motion.
- Resist with the leg: Let the raised leg push or hold against the towel so the arms must work through resistance.
- Keep elbows stable: Do not let the upper arms swing around. The motion should come mostly from elbow flexion.
- Squeeze at the bottom: Pause briefly when the elbows are bent and the towel is closest to your body.
- Return slowly: Extend the elbows under control, allowing the towel to move back toward the foot.
- Maintain tension: Do not let the towel go slack between reps.
- Repeat evenly: Perform all reps with the same tempo, then switch legs or reset as needed.
Pro Tips & Common Mistakes
Pro Tips
- Use steady towel tension: Keep the resistance consistent from start to finish.
- Squeeze the towel: A firm grip increases forearm activation and makes the movement more effective.
- Control the lowering phase: The eccentric portion is excellent for forearm strength when done slowly.
- Keep the shoulders quiet: Avoid shrugging, rounding, or pulling the shoulders off the floor.
- Adjust with the leg: Push harder with the foot to increase resistance or reduce leg pressure to make it easier.
- Use a thick towel: A thicker towel challenges grip more than a thin towel.
Common Mistakes
- Pulling too fast: Jerky reps reduce control and can irritate the elbows or wrists.
- Letting wrists bend: Keep the wrists aligned with the forearms to protect the joints.
- Losing towel tension: Slack at the top makes the exercise less effective.
- Using the shoulders too much: This should feel like an elbow-flexion and forearm exercise, not a shoulder row.
- Over-resisting with the leg: Too much leg pressure can make the motion messy and uncomfortable.
- Arching the lower back: Stay relaxed through the trunk and keep the spine supported.
FAQ
What muscles does the Lying Single-Leg Reverse Biceps Curl with Towel work?
It primarily targets the brachioradialis, a major forearm muscle involved in elbow flexion. It also works the wrist extensors, grip muscles, brachialis, biceps, and stabilizing muscles of the core and hip.
Is this exercise good for forearm growth?
Yes. When performed with enough tension, controlled reps, and progressive overload, it can help build forearm size and strength. The reverse grip places more emphasis on the brachioradialis than a standard palms-up curl.
Can beginners do this exercise?
Yes. Beginners can start with light towel tension and slow reps. The exercise is easy to scale because the leg controls how much resistance the arms must overcome.
Should my palms face down the whole time?
Ideally, yes. A reverse grip means the palms face down or slightly inward. This grip shifts more work toward the forearms and brachioradialis.
Why do I feel this in my biceps too?
That is normal. The biceps still assist with elbow flexion, but the reverse grip reduces its mechanical advantage and increases the demand on the brachioradialis and forearm muscles.
How can I make it harder?
Use a thicker towel, squeeze harder, slow down the lowering phase, pause at peak contraction, or increase resistance by pressing more firmly with the raised leg.
How can I make it easier?
Reduce leg resistance, use a shorter range of motion, slightly bend the raised knee, or perform fewer reps with a slower and more comfortable tempo.
Is this better than dumbbell reverse curls?
It is not necessarily better, but it is a great alternative when you do not have weights. Dumbbells provide measurable loading, while this towel version offers adjustable self-resistance and strong grip involvement.
Recommended Equipment
- Workout Towel — essential for performing the movement with secure self-resistance.
- Exercise Mat — provides comfort and support while lying on the floor.
- Grip Strengthener — useful for adding extra hand and forearm training outside the exercise.
- Forearm Wrist Roller — excellent for building wrist, grip, and forearm endurance.
- Resistance Bands Set — helpful for progressing reverse curls, rows, and other arm-strength exercises.
Choose equipment that supports control and comfort. For this exercise, a strong towel and a soft mat are the most important tools.
