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Exercises
Exercises

Sissy Squats

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Historical reference: its only source is the original reference manual, and some of it may be out of date. Not used for AI answers until re-sourced.

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quadricepsisolationbodyweightlower-body

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Exercise demo
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Body-weight knee-dominant squat that works all four quadriceps; placed in the "stretch" position of the Positions-of-Flexion quad chart.

Detail

The sissy squat works all 4 quadriceps. The source notes it in the context of quadriceps training (rectus femoris, medialis). It appears as an advanced/free-weight quadriceps selection and occupies the "stretch" position of the Positions-of-Flexion chart for quadriceps.

Key facts

  • Primary Muscles: All 4 Quadriceps.
  • "Stretch" position in the Positions-of-Flexion quad chart.

Connections

Sources

Historical reference · reference manual (page cited)
p.32p.104p.492p.672
Cited authorities in source: none specified for this entry.

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Atlas Connections

Knee Joint Range of Motion
The knee is a hinge joint that straightens to about 0° and, in healthy adults, bends to roughly 133–142° depending on age and sex (CDC reference data). The "90°" often quoted is the arc of a seated leg extension, not the knee's full range.
Quadriceps
The four knee extensors — rectus femoris, vastus medialis, vastus lateralis, vastus intermedius (rectus femoris also flexes the hip); the leg-extension arc is ~90° (knee bent to straight).
Rectus Femoris
A 2-joint quadriceps muscle that flexes the hip and extends the knee.
Intensity
The amount of weight (resistance) lifted — also shaped by speed, reps, sets, rest interval, and workout duration.
Deep Knee Bend / Lunge / Squat — Contraindicated Ballistic Stretch
Bouncing or forcing into deep knee bends, lunges, or squats as a stretch is marked "X" in the source (said to strain the knee's lateral ligaments, compress the kneecap, and pinch cartilage). This is about ballistic end-range stretching, not controlled deep squats, which are safe for healthy knees.