According to Osho, Krishna calls life a bondage when it’s driven by attachment to the fruits of action: desire and future-focused motives yoke us to the cycle of birth and death, making us captives (pashu) dragged by hopes and fears. Action itself isn’t the chain; clinging to results is. Freedom arises naturally by acting totally in the present without seeking outcomes.
Chasing results ties you like a leash to tomorrow; do your best now without grabbing for outcomes, and you become free.