You needn't necessarily jump for joy to be happy; however, it doesn't hurt per se to jump when happy! I sometimes do or at times do what I call "my happy dance." Read more about this on this relatively short post: http://xpressyouressence.blogspot.ca/2011/07/happy-dance-s.html ;)
Joy is "a feeling of great pleasure and happiness" as per Google. It is one of the highest vibrational feelings in terms of positive energy. Do you ever notice at times how infectious joy can be, similar to laughing?
Likewise, ecstasy can be described as "an overwhelming feeling of great happiness or joyful excitement" according to Google.
Joy - or ecstasy also known as 'highest excitement'(?) on the vibrational emotional scale below - is one of the highest expressions of emotions.
Tell me, what brings you great joy? Do you ever jump for joy or dance for joy?