Holding two dumbbells, inhale and sit back onto heels and squat (really sit back, as if touching an imaginary chair)..
as you extend and raise both arms shoulder height keeping your arms long and flexed.
Exhale back up to starting position keepings arms close to body and straight back behind you – AS YOU RAISE ONE KNEE up toward chest crunching your abs.
Inhale back into the squat, and exhale the opposite knee to that side of your chest.