What is the most effective way to strengthen core muscle?

there are lots of things u can do

squats strengthen

lunges strengthen

any time u lift heavy weights during weight traiining whole core gets strengthened

u can also do body weight exercises

burpies

bicycle crunches

planks

abs only need 5-10 mins of training everyother day

the rest u get from strength training

you have to do cardio to lose fat so the muscle can be seen. to get the muscles big do v ups with a 45 lb plate, russian twists with 45, and leg lifts. youll get abs in no time. do three sets of 15. if you can easily do more, up the weight. do it about 3 times a week.