{
  "$schema": "https://openexercise.org/schema/v0/exercise.json",
  "aliases": [
    {
      "text": "Heel Drop Calf Stretch",
      "kind": "common"
    },
    {
      "text": "Calf Stretch off a Step",
      "kind": "common"
    },
    {
      "text": "Stair Calf Stretch",
      "kind": "common"
    }
  ],
  "anatomy": {
    "muscles": [
      {
        "muscle": "gastrocnemius",
        "role": "stretched"
      },
      {
        "muscle": "soleus",
        "role": "stretched"
      }
    ],
    "joints": [
      {
        "joint": "ankle",
        "actions": [
          "dorsiflexion"
        ]
      },
      {
        "joint": "knee",
        "actions": [
          "isometric-stabilization"
        ]
      },
      {
        "joint": "subtalar",
        "actions": [
          "isometric-stabilization"
        ]
      }
    ]
  },
  "classification": {
    "modalities": [
      "flexibility",
      "mobility"
    ],
    "movement_patterns": [
      "stretch",
      "isolation-ankle"
    ],
    "mechanics": "isolation",
    "force": "static",
    "kinetic_chain": "closed",
    "laterality": "unilateral",
    "planes": [
      "sagittal"
    ],
    "contraction": [
      "isometric"
    ],
    "level": "beginner"
  },
  "equipment": {
    "optional": [
      "wall"
    ],
    "required": [
      [
        "step",
        "plyo-box",
        "weight-plate"
      ]
    ]
  },
  "external_ids": {
    "wger": "2666"
  },
  "id": "oec:step-calf-stretch",
  "instructions": {
    "setup": [
      "Place the ball of one foot securely on the edge of a step, sturdy box, or raised plate.",
      "Lightly hold onto a railing, wall, or upright structure for balance.",
      "Keep the non-working foot resting on the step or hanging free with minimal weight."
    ],
    "steps": [
      "Keep the working knee extended (straight but not hyperextended) to emphasize the gastrocnemius.",
      "Slowly lower the heel downward off the edge of the step until a gentle to moderate stretch is felt along the back of the lower leg.",
      "Hold the position smoothly without bouncing for the intended duration.",
      "Step back up to neutral and repeat on the opposite leg."
    ],
    "breathing": "Breathe slowly and rhythmically throughout the hold, exhaling into a slightly deeper stretch as tension releases.",
    "cues": [
      "Heavy heel sinking straight down",
      "Keep the ankle tracking straight",
      "Maintain a tall, upright posture"
    ],
    "common_faults": [
      {
        "fault": "Bouncing or pulsing at the bottom of the stretch.",
        "correction": "Hold a steady, static position to prevent invoking the stretch reflex and straining the Achilles tendon."
      },
      {
        "fault": "Letting the ankle collapse inward (excessive pronation).",
        "correction": "Keep the weight evenly distributed across the ball of the foot and drop the heel straight down."
      },
      {
        "fault": "Bending the knee when attempting to stretch the upper calf.",
        "correction": "Keep the knee extended to target the gastrocnemius; only bend the knee if deliberately targeting the deeper soleus muscle."
      }
    ],
    "safety": {
      "precautions": [
        "Ensure the step or box is completely stable and slip-resistant before placing weight onto it.",
        "Maintain light hand contact with a solid surface to eliminate balance loss."
      ],
      "spotter": "not-needed"
    }
  },
  "measurement": {
    "duration_counted": "per-side",
    "load": {
      "kind": "none"
    },
    "profiles": [
      {
        "required": [
          "duration"
        ]
      }
    ],
    "records": {}
  },
  "name": "Step Calf Stretch",
  "provenance": {
    "generated": [
      "/name",
      "/summary",
      "/classification",
      "/anatomy",
      "/equipment",
      "/measurement",
      "/instructions",
      "/setup"
    ],
    "license": "CC-BY-SA-4.0",
    "review": {
      "status": "machine-generated",
      "model": "gemini-3.8-flash",
      "at": "2026-10-31"
    },
    "sources": [
      {
        "title": "wger: Step Calf Stretch",
        "url": "https://wger.de/en/exercise/2666/view-base",
        "license": "CC-BY-SA-4.0",
        "author": "trs1800"
      }
    ]
  },
  "setup": {
    "position": "standing",
    "range": "full",
    "stance": {
      "kind": "single-leg",
      "width": "hip"
    }
  },
  "status": "active",
  "summary": "A static lower-leg flexibility exercise performed by lowering the heel off the edge of a raised surface to lengthen the calf muscles."
}