@Dutchess_III I’m not saying sit-ups are worthless from personal experience.
“Traditional sit-ups emphasize sitting up rather than merely pulling your sternum down to meet your pelvis. The psoas muscles run from the lower back to the front of the thighs. This muscle action is to pull the thighs closer to the torso.
This action is the major component of sitting up. Because of this, when you are doing sit ups your psoas muscles are the primary muscles being engaged and not your abdominal muscles.
So, sit-ups are a pretty useless exercise if you want to get your abs in shape. Instead, use crunches, because they directly work your abs.”
That’s from bodybuilding.com, but there are plenty of other sources as well that concur with this.
In the end, you can’t spot treat. You can’t get awesome abs from just crunches or sit-ups. There are people (perhaps you are one of them) that are lucky enough to have good abdominal strength/muscle without having to do much of anything, thanks to their genes. My husband’s aunt has a 6-pack and the woman doesn’t work out…ever. I suspect a little too much testosterone, but none of my business. You can do crunches or sit-ups until you’re blue in the face, but if you have extra fat covering the muscles, those exercises won’t help. Even after weight loss, sit-ups and crunches are pretty useless. Compound exercises that engage the core as well as other muscle groups are the most effective way to tone your body.
Good for you with your washboard abs and all, but doing 100 sit-ups a day alone isn’t going to give most of us killer abs like people seem to think. Plus, there are SO many core exercises that engage those muscles as well as your entire core (including obliques, lower back, upper and lower portions of the abdominal sheet) – crunches, reverse crunches, side hip raises, leg raises, etc.
And planks. Planks are probably the most effective exercise for strengthening your core. Standard planks, high planks, single-leg planks, side planks, hip dips, etc. Fantastic full-body move, as it also engages your shoulders, quads, lower back, and obliques.
Maybe “useless” is a strong word, but sit-ups are FAR from the best abdominal workout.