I really like Ryan Debell from the Movement Fix. A bunch of us took his seminar last year and it was great! here is a great little video on fixing the biggest mistake in lunging. I always tell people to think about propelling forward in walking lunges to avoid this weird back arch. You need core strength and leg/glute strength to do a lunge well. I like his recommendation of engaging the core in slight flexion.
Enjoy!
Strength: Back Squat
WOD:
For Time:
50-40-30-20-10: AbMat Sit-Ups
25-20-15-10-5: Calorie Bike
10-8-6-4-2: Deadlifts 225/155