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Light aerobic activity (bike, treadmill, rower, etc.) that elevates the heart rate 20–30 bpm above rest for 5–10 minutes, to raise muscle temperature, boost blood flow, and reduce injury risk.
From "Standards for Exercise Program Recommendation," section I.A (Warm-up: Aerobic / General):
Purpose: To increase circulation to the major muscle groups. The warm-up elevates muscle temperature, increases blood flow, and reduces the risk of injury.
Mode: May utilize a treadmill, bicycle, cross-country skiing, stair climbing equipment, or rowing ergometer.
Intensity: The activity should create enough cardiovascular stimulation to elevate the heart rate 20 to 30 beats above the resting rate.
Duration: The warm-up should last 5 to 10 minutes.
Note: although this aerobic warm-up content resembles conditioning, it is held here under flexibility/warm-up because it is part of the flexibility/prep standards; for cardiorespiratory training proper, see cardiorespiratory-guidelines. The specific (exercise-movement) warm-up is in warm-up-specific.
Educational content only — not medical advice. Always consult a qualified professional for individualized guidance, especially around injury, pregnancy, or medical conditions.