EZ-bar 21s exercise animation (Hombre)

EZ-bar 21s

Músculo objetivo
Biceps Brachii, Brachialis
Músculos sinergistas
Brachioradialis
Equipamiento
EZ Barbell
Parte del cuerpo
Upper Arms
Tipo
Strength

The EZ-bar 21s is a high-volume biceps builder that combines three sets of partial-range curls into a single grueling set. It primarily targets the biceps brachii and brachialis, with the brachioradialis assisting, and the angled EZ bar keeps your wrists in a more comfortable position than a straight bar. Each set is 21 reps: 7 lower-half partials, 7 upper-half partials, then 7 full-range curls.

Cómo hacer el EZ-bar 21s

  1. 1Load an EZ barbell and grip the inner angled portion with an underhand (supinated) grip, hands roughly shoulder-width apart.
  2. 2Stand tall with your feet hip-width apart, knees soft, and pin your elbows against your sides with the bar hanging at full arm extension.
  3. 3Phase one: curl the bar from full extension up to the halfway point (forearms parallel to the floor) and lower back down for 7 controlled reps.
  4. 4Phase two: without resting, curl the bar from the halfway point up to full contraction at the top and lower back to halfway for 7 reps.
  5. 5Phase three: again without resting, perform 7 full-range curls from full extension all the way to the top.
  6. 6Keep your elbows fixed and your upper arms still throughout all 21 reps so the biceps do the work.
  7. 7After the final rep, lower the bar under control to full extension and set it down.

Consejos de técnica

  • Use a lighter weight than your normal curl — the accumulated 21 reps and constant tension fatigue the biceps fast.
  • Squeeze the biceps hard at the top of each upper-half and full rep, and resist the bar on the way down.
  • Brace your core and avoid leaning back; let the arms, not your torso, move the bar.
  • Rest the angled grip in your hands so your wrists stay neutral and stacked over your forearms.
  • Keep the tempo steady across all three phases rather than rushing the partials to beat the burn.

Errores comunes

  • Swinging the torso or using body English to heave the bar, which shifts work off the biceps and strains the lower back.
  • Letting the elbows drift forward or flare out, which turns the curl into a partial front raise and reduces biceps tension.
  • Cutting the partial ranges short — half reps that don't reach the true midpoint or top remove the time-under-tension that makes 21s effective.
  • Starting too heavy, so form breaks down by the second phase and you can't complete the full-range reps.
  • Bending the wrists back under load, which stresses the wrist joint and leaks force away from the biceps.

Preguntas frecuentes

What muscles do EZ-bar 21s work?

They primarily work the biceps brachii and the brachialis, with the brachioradialis of the forearm assisting. The three rep ranges hit the biceps through both the stretched and contracted portions of the curl.

What does 21s mean?

A set of 21s is 21 total reps in three parts: 7 curls through the lower half of the range, 7 through the upper half, and 7 full-range reps — all performed back to back without rest.

Why use an EZ bar instead of a straight bar for 21s?

The EZ bar's angled grip lets your wrists sit in a more neutral, semi-supinated position, which is more comfortable and reduces wrist strain during the high-rep set while still loading the biceps and brachialis.

How much weight should I use for EZ-bar 21s?

Go lighter than your usual curl weight — often 40 to 60 percent of it. The 21 continuous reps and constant tension are far more demanding than a standard set, so most lifters need to drop the load.

How many sets of 21s should I do?

Two to three sets is plenty for most lifters, as a finisher at the end of an arm or pull workout. One set of 21s already delivers high volume, so there's no need to overdo it.

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