In another posted on Instagram he asked fans "Will you be remembered?" just a month before he died.
The inspiring short clip showed the 37-year-old working out in the gym before bungee jumping off a cliff face with the words 'It's your life' across the screen.
As the images play Greg says: "A new vision, authority, belief, confidence in yourself...the world's your playground- limitless."
He then asks: "Will you be remembered?".