WATCH: The workout move Jennifer Aniston 'loves'Speaking exclusively to HELLO!, Dani, who is VP of training at PVOLVE, the exercise regimen Jennifer famously follows, revealed: "Jen and I love to play with different plank variations. It may look playful in the video, but it actually requires your entire body to work together in a very controlled way." Why it worksFitness professional Tara Riley explains: "Plank to pike is incredibly challenging as it recruits multiple muscle groups at once and requires strength and control. "Deltoids, triceps, upper back and chest muscles work to stabilise the upper body through the transition. © Getty Images Jennifer's workout tones all of her bodyAlternative options for beginnersIf the plank to pike feels inconceivable (for now!)