Workout Notes:
The lunges are R+L=2. You're welcome.
Lunge twist: A regular walking lunge holding a dumbbell at your waist. Step forward into the lunge with your right leg and twist to the right at the bottom of the lunge, then repeat on the left side.
Stab Crunches: Be sure to get fully extended back on each rep. Interlock your fingers behind your head (keep elbows back please). Flex your trunk as far forward as flexibility will allow.