You know I love Tracey Mallett. Why? She's challenging, but the exercises can be done safely even if you can't do every repetition. Great instructions and hell, the woman looks heavenly in lycra. Surely that's the inspiration to keep going you need!
So, here's an abdominals workout to love:

Pilates Super Sculpt:


What you need:

• Yoga mat
• Semi-soft ball ($3 pool toy ball from Kmart, Target, $2 stores does the trick!)