Try 2 x sets of 12 keeping it smooth & equal. Take your time both ways.

You can do about 8 of the moving forward and back hovers and about 4 walking hovers alternating legs.
Drop to your knee’s or to the floor to decrease the intensity especially if you feel it more in the shoulders than abdominals.

Disclaimer: As with any type of physical activity, it is advised you warm up for 5 minutes before commencing exercise, followed by 5 minutes of stretching upon completion. These exercises are designed as a basic guide and professional consultations should be taken before commencing any exercise.
Pictures Courtesy of: Les Mills