Premise: "A gymnast in navy sparkly blue warms up for her routine."\nHypothesis: "The gymnast is at a competition."\nDo we know that the hypothesis entailed by the premise?
A step-by-step solution is:
it is not possible to tell
Just because a gymnast warms up for her routine doesn't mean she is at a competition.

.

So, the answer is it is not possible to tell