Part of my divemaster training included free diving training. While I hatted it, I experienced the same thing as you did: I could hold breath for a minute out

Part of my divemaster training included free diving training. While I hatted it, I experienced the same thing as you did: I could hold breath for a minute out of water and 2:08 underwater. There's the preparation, getting calm and relaxed, but there's also the diving reflex playing some part there and preparing your body for longer immersion.