2 questions for 6-pack-abs men and weight lifters?

i do regular sit ups for 2 months now, and i can see my upper abdomen humps pretty nice. how can i flatten the lower part? it appears slower to develop.
i’m also into dumbbells. How many minutes should i rest in between exercises? i lift 4 kgs to 8 kgs on different exercises.

kabayan, wala akong advise sayo. just stay healthy yun lang. best answer kita sa Q ko. sabi mo kasi depressed ka, smile ka na, may 10pts ka na. babaw no. try ko kanina mag send ng email pero “enable” daw, so i really cant send you any. until next time, bye.

Exercises To Flatten Your Stomach: Six Pack Ab Myths