I've found Pilates, particularly the 100's to be a good start to the day,
Along with push-ups, side-to-side rib-cage/torso slides, and modified hip-lifts (or snaps - good for strengthening and building support for the knees, too) (the last two learned from my SO from her belly-dance days) to give the core a good warm up for the day. I've taken up walking, about 30 minutes a day or as much as possible. All this has been to get my blood cholesterol under control, too.100's
Lie face up and bring legs up, keeping them straight and together. Lift head and shoulders off the ground, pulling in the abs (don't let them bulge out) and bringing hands next to thighs. Lower the legs as much as you can while keeping your back on the floor and press hands up and down, counting with each press. Inhale for 5 counts, exhale for 5 counts and repeat until you hit 100, lowering your legs once again halfway through.
What do you like to do?