JACKHAMMERSfor the abs is a compound exercises that strengthens the abs and a workout for the arms
muscles activated
TRICEPS
ABS
PECS
01.
Lay on the floor with your legs 6-inches slightly off the ground and extend your arms behind you, holding the end of a dumbbell about a foot off the ground.
02.
Lifting both your arms and shoulders upward while simultaneously bending your legs
03.
Fully engage your core into a crunch position and hold for one second.
04.
Slowly with control release your legs and lower arms to the starting position.30 reps