Any good exercises to gain muscles on the lower stomach?

I liked that you asked about gaining muscle on the lower [abdomen] stomach instead of asking about how to get ripped abs. As someone who has dealt with weak and compromised pelvic floor muscles and hip flexors in the past, I believe that building strength and mobility in the lower abdominal/pelvic area is vital for increasing one's functionality level.

So it's technically true that the abdominal wall is made of vertical, diagonal, and horizontal sheets of muscle that are not separated into "upper" and "lower" sections. However I think it's okay to imagine the abs as being broken up into regions as it helps the exerciser mentally focus on correctly controlling the abdominal wall during ab strengthening exercises.

I think that the lower abdominal wall is easy to neglect and not properly engage in many traditional ab exercises.

How do some people eat so much but still remain thin?

This is mainly due to high metabolic rate i.e. these super thin people burn food to fuel quite quickly. If the person is normally thin then its fine. But there are some people who eat a lot and can never even gain a single Kg, this is an aberration from normal. Such people might have

What is the most humane and painless way to kill an animal?

There is actually some twisted psychological things going on when someone decides they need to ‘humanely' dispatch an animal. Some of our greatest horrors and atrocities took place because of feelings one needed to do something humanely.I'd provide an example.I was in survival training and a key portion of the survival training

Is there a muscle in particular that grows the easiest or do all muscles grow at the same rate?

All muscles do not grow at the same rate, but this is mainly due to the purpose and size of these muscles and how we use them.Some muscles like our biceps are easily exercised and it shows rather fast if we exercise them. Something like the