I used to lift weights about 4 times a week, but would work on different body sections…
Like 1 day would be upper body, one would be lower body, etc…Didn’t care to work out more than that honestly (and I was even single and younger then too). Also try to do quick crunches, etc…vs situps IMO since there is a lot of “resting” when you’re up with situps.
Like others have suggested, to burn the stomach fat, you need to burn everything else off. That would be lots of cardio. I used to run 2 miles and never could gain weigh…After I stopped and maxed the protein, weight went up with very limited cardio (I wanted to gain weight and bulk up more) since most people considered me “skinny”.
I started weight about 135 (very light) and bulked up to about 160 or so near the end of it. Still around that range more or less. I think at the highest, max bench was around 200 or so. Doubt I could do much more than the bar now.
Muscles would get tired after / next day so probably good to rest them.