Twist Crunch (Legs Up)
- Músculo objetivo
- Obliques, Rectus Abdominis
- Músculos sinergistas
- Quadriceps, Sartorius, Tensor Fasciae Latae
- Equipamiento
- Body weight
- Parte del cuerpo
- Waist
- Tipo
- Strength
The twist crunch (legs up) is a bodyweight waist exercise that targets the obliques and rectus abdominis by combining a standard crunch with a rotational reach while the legs are held vertical. Keeping the legs raised removes hip-flexor dominance and forces the abs and obliques to work through the full crunch range with rotation, with the quadriceps, sartorius, and tensor fasciae latae stabilizing the elevated legs throughout.
Cómo hacer el Twist Crunch (Legs Up)
- 1Lie flat on your back on a mat. Raise both legs straight up so they are perpendicular to the floor and your lower back is pressed firmly into the mat.
- 2Place your hands lightly behind your head with your elbows wide, or cross them over your chest — do not pull on your neck.
- 3Brace your core, then exhale as you curl your upper back off the mat, simultaneously rotating one shoulder toward the opposite hip.
- 4Reach the twist until you feel a strong contraction in the oblique on the side you are rotating toward.
- 5Hold the peak contraction for one count, keeping your legs vertical and lower back flat.
- 6Inhale as you slowly lower your upper back back to the mat under control.
- 7Repeat on the same side for your reps, then switch to the opposite side, or alternate sides each rep depending on your preference.
- 8Complete all reps and lower your legs back to the mat to finish the set.
Consejos de técnica
- Keep your lower back pressed into the mat throughout — any arch during the movement signals that your hip flexors are taking over.
- Initiate the rotation from your shoulder, not your elbow, to ensure the obliques do the work rather than momentum.
- Keep your legs as vertical as possible; letting them drift forward shortens the range the core must stabilize and reduces the challenge.
- Move slowly and with control — a deliberate tempo maximizes time under tension on the obliques and reduces the risk of neck strain.
Errores comunes
- Pulling on the neck with the hands, which strains the cervical spine and shifts the effort away from the abs.
- Using momentum to swing the torso up rather than contracting the abs, which reduces oblique engagement and can cause lower-back strain.
- Letting the legs drop forward as fatigue sets in, which reduces core stabilization demand and takes tension off the abdominals.
- Rotating only the elbow toward the knee instead of rotating the shoulder, which makes the movement superficial and misses the oblique contraction.
- Holding your breath during the crunch — exhale on the way up to facilitate core compression and a stronger contraction.
Preguntas frecuentes
What muscles does the twist crunch (legs up) work?
It primarily targets the obliques and rectus abdominis, with the quadriceps, sartorius, and tensor fasciae latae working as stabilizers to keep the legs vertical throughout the movement.
Why are the legs raised for this exercise?
Raising the legs vertical tilts the pelvis and flattens the lower back against the mat, which reduces hip-flexor involvement and forces the obliques and rectus abdominis to do more of the work compared to a standard crunch with feet planted.
Is the twist crunch (legs up) good for beginners?
Yes — it requires no equipment and the legs-up position actually makes it easier to maintain a flat lower back than a standard twisting crunch. Beginners should focus on slow, controlled reps and avoid pulling on the neck.
How many sets and reps should I do?
For core endurance and definition, 3–4 sets of 12–20 reps per side is a solid starting range. Rest 30–60 seconds between sets and prioritize quality of contraction over total rep count.
What is the difference between a twist crunch (legs up) and a bicycle crunch?
In the bicycle crunch the legs pedal alternately while you rotate, which also works the hip flexors dynamically. In the twist crunch (legs up), both legs stay fixed in a vertical position, isolating the rotational work to the obliques and rectus abdominis with minimal leg movement.
