Of course it is. If you wonīt train hard you canīt progress. Thatīs just the way how human body works.
You have to work versatile and all the time a little bit harder, otherwise your improvement stops. Just remember take care of the rest and nutrition.
Actually what i thought was basically when it starts hurt (When you do exercises) that is when the muscle is breaking down the most, that is you will get the most benefit. So say if your doing 60 press ups and you get to like 45 and it hurts, just push the extra bit and it does a world of good for your arm/shoulder muscles.
its true for someone who wants to push themselves to their limits and beyond.however you should never push the pain threshold if you are training with an injury.the "pain"there, is the body telling you to stop what you are doing.rest and nutrition is just as important as the training itself(as Green Tea said).
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