Front end loading is when you start the cycle with a high
dosage and lower the dosage later in the cycle. This is useful for things like sustenon which are time released and have a long life span in your system. For example , to maintain the amount of propenate in your body while you wait for the other esters to kick in you can have a dosage like this:
week 1: 1000mgs
week 2: 750 mgs
week 3: 500 mgs
It looks like alot on the first week but really you only would have about 300 mgs of test active in your blood. On the second and third week it would go up of course so you can reduce the amount on those weeks.
In fact in this example you would have about 6 good weeks of test in your body from three weeks of injections.
I find a three week cycle like this much more effective then a five week cycle at 500mgs.
I would say the only time you would want to front load is when you use juice with long esters or half lives ( deca,eq,sust) and while you wait for it to kick in you use alot of propinate and/or winstrol and/or anadrol.