We must also state and cannot over emphasize enough; if you have numerous or even countless cycles under your belt yet are losing half or even more than half your gains from each one you are not ready for an advance cycle. The reason is simple; youre obviously doing something wrong. Absolutely, when a cycle has ended and some time has passed some of the progress will be lost. Without the high influx of hormones in your system you will not be able to maintain what you have achieved at a 100% level. Even so, you should be able to maintain a great deal of it, especially when referring to bulking. Cutting can be a little different as once a diet is over, anabolic steroid use or not you will not hold peaked conditioning but this doesnt mean you have to turn into a fat pig. The point; you should be able to hold onto progress to a large degree and if you cant you need to revisit more moderate cycles and most importantly revisit your nutritional and training plans.