Your body physically responds to tempo in measurable ways:

• Music at 60-80 BPM matches resting heart rate and promotes relaxation. Hospitals use slow music to ease patient anxiety
• Music at 120-140 BPM matches walking to jogging pace, the sweet spot for most pop and dance music
• Music above 150 BPM pushes toward excitement. Drum and bass (~170 BPM) builds intensity through sheer speed
• Tempo entrainment pulls your heart rate toward the beat, so fast music speeds up your pulse and breathing

DJs exploit this, gradually raising tempo over a set to push the crowd's energy higher.