If you just "go through the motions" during exercise you will never get the full benefit. You must understand, at least to a small degree, how the body works and how it reacts to things - stimulus.
This is important to fully understand what your body needs to grow (muscles) shrink (body fat) and rejuvenate, revitalize your own internal machine. Without this understanding and just constantly throwing various workouts at it or decreasing caloric intake for no apparent reason your body will fight thinking it is under attack. And believe it or not - it is....
You are putting your body at risk and attacking it from all sides without any rhyme or reason. Your body defends itself by gaining weight and storing fat (in case of famine), shutting down ("Oh, I am soooo tired") and even in extreme cases reducing blood and nutrient flow to the extremities (this is why your hands/feet and legs/arms get colder first).
Your "core" (basically your torso and head) are your most important parts - this is where all the organs are kept, all the main machine functions are performed.
If you think about a robot you won't be too far off. Your brain is the processing center, the computer, this is where all the thinking takes place (or should). The brain tells the body what to do and how to do it. It sends these signals through wires connected from your brain through the spine. The spine is like a conduit (a pipe) that has all these wires in it. If you put a kink in this pipe/hose then information cannot flow and the signals get lost.
Strengthening the core makes a stronger pipe, thicker wires, allowing better communication. This increased communication will also allow more nutrients to flow (both up and down the pipe/wires).
As you strengthen the core you also increase the functionality of the organs (heart, lungs, liver, etc.). By increasing these functions the body can more efficiently use the stored fat for function and performance. When your body uses that fat it "burns" it / converts it to energy to allow the organs to work better and keep that communication flowing.
When you "burn" that fat the storage location (ie. your stomach and other areas) decreases. This in turn means less work for your bones to hold up all that weight. You move faster, become stronger and feel better. (You look better too which doesn't hurt! :) )
All this because you "properly" understood what your body and brain needed. The proper nutrition plus the proper exercise not only helps the body and mind it doesn't attack it and put it on the defensive.
This and more can be yours....any time you want it.
Do yourself, your brain and your body a favor - help it become the better machine, the better person you want.
T-Tapp is one way, my suggested way, to do that.
Look it up, check out the online try-before-you-buy videos and feel free to tweet/post/email/call me to let me know how I can help you.
Master T-Tapp Trainer, Fitness Consultant, Health Coach