Splits alone (sinking into the stretch) doesn't require much strength, it is more about relaxation. Generally you will develope RoM strength in your adductors.

Active splits I find more impressive, as you need incredible strength in your abductors to pull into them and deactivate your adductors.

Try doing an alternate exercise like someone suggested, or varying how many reps you use, maybe something like a drop set.

You can't target your fat without also experiencing fat loss in other areas, unless you get a liposuction or something. You generally can't dictate where fat is put or lost from. In some cases, disorders like AIDS can cause a shift in body fat storage, so improved health might cause abdominal fat re...

Sprinting is very tasking so I doubt you would need to do any additional work. It is largely anaerobic, but that works your cardiovascular system too. The only concern would be if you weren't able to sprint for very long periods, in which case it might not stress the system enough to adapt, so you m...

Yes, it can be good.

Have some simple carbs before you go running. Running before breakfast might burn more fat, but it burns more muscle too. Also, since your glycogen stores are starting to get depleted, your endurance will be limited.

It's better to eat first, so you can do harder cardio.