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Forget crunches and sit-ups.
One of the best ways to blast your core is the oh-so-simpleplank.
Eastwood has an A-list client base including Anne Hathaway, Stanley Tucci and Emily Blunt.
Her method is a mix of Pilates, dance, strength training, ballet and yoga.
Wait till you try this.
What is the 3-minute plank challenge?
Eastwood adds that this is an all-over workout.
Plus that killer side tap forces you to utilize your oblique muscles to keep your torso stable.
The secret to achieving success is moving with complete control.
If youre finding it too difficult, lower the number of reps you complete on each side.
