I have worked out everyday for years and would suggest that sit ups aren't doing anything for weight loss. Weight loss comes from cardio.
That said, staying toned is a good idea.
Here is a video that I posted at FR that might also help...Get Fit In 6 Minutes! (How intensity training improves health/aging - video)
Good luck. Looks like you are really sticking with the program.
Well, a big part of the situps is to get the skin on my stomach to tighten up.
I found this interesting and think I’ll give it a try for 6-10 minutes a week on my stationary bike.