Premise: A man with sunglasses and earphones is on a city street holding an mp3 player in his hand.

Hypothesis: man sleeping on the couch
no

Premise: bunch of people standing around in blue jumpsuits with guys in suites in the background

Hypothesis: There is a group of people doing gymnastics.
no

Premise: Woman vaulting over a vaulting horse.

Hypothesis: A profession athlete vaults over a vaulting horse at the olympics.
it is not possible to tell

Premise: Two mountaineers are looking ahead on a snowy trail.

Hypothesis: Two men climb a mountain.
it is not possible to tell