Stand with a chair for balance so your focus can be on your legs and abs.
To Execute this:
Start with weight on one leg, and step back with other leg, GENTLY touching the floor with back leg toe. You will naturally, as I am here, LEAN forward a bit, sitting back so your front knee does not come forward of your heel. Inhale as you lower down 45 degrees on front leg, THEN
Exhale as you bring your BACK leg up and crunch it to your abs. Bring same leg from crunch back gently to floor behind you doing another 45 degree lunge on front leg. Do 8 repetitions, then repeat 8 reps on other side.