Go to a CHI pool and make sure you are full of CHI, then tap the CHI icon on bottom right to unlease your CHI.
Now, hold down to jump (hold down the
button) after the 5th jump the trophy will pop. Do five jumps all in same CHI up for it to unlock, five separate jumps do not count on five different CHI up times.
As an added bonus for this "hard" trophy - it's also a gold one.
*Thanks to deutschZuid for pointing out the
button is the one to use.