Deca is a great addition for a off season same as alot of long lasting esters keeping regular blood work and all in check is essential to regulate any sides no matter anything your doing/running.
Short ester compounds are normally run for prep phases leading up to stage, 12 weeks out sometimes even further or so, heavy pinning is then introduced with short ester EOD etc or so this is when the real fun starts, that's why physiques change so drastically so fast in lead up weeks in prep phase, this has always been protocol forever.
Along with diet and consitistant nutrition, added cardio aswell to burn into a nice deficet.
Seems alot people want maximum results in minimal amount of time these days, short fast acting esters will achieve that alot faster of course.
I always advise, once your on "you are on for life" cycles don't exist that's a myth, blast and cruise. Long esters are great for cruises and still making additional progress.
playing with hormones and your endocrinologist system, will be fully shut down wether short ester or long.
For cruise phase long esters are still the way to go, if you want too look great really fast and impress your friends in 12 weeks, short esters cycles are the way too go, but dont think you can then jump off and keep anything, literally you will feel the wrath of 0% test production, taking months and months to recover.
In short Nandrolone deca still definitely has its place and is a very usuaful tool in the belt for offseason or cruises for progression just depends on what phase your in.
Much Love
KAOS