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Digibike
9 months ago

Because muscles are violently contracting and causing stress to which the heart reacts…

Ashihrsaftladen
9 months ago

Because faster or more blood must be pumped through your body.

SirSulas74
9 months ago

Because adrenaline and cortisol are discharged.

SirSulas74
9 months ago
Reply to  Kauschinio

Yeah, the body feels that threatening.