I left strenght training 3 months ago. now there are muscle twitching in my whole body, no weakness , no atrophy. but nowthere are pins & needle (leg)?

One possibility..: Although rare, there is a neurologic condition, benign fasciculation syndrome characterized by twitches, cramping, tingling without weakness (that is a quick summary). See a neurologist or a physiatrist for evaluation to be sure. Whether it is this or something else, physical exam can reveal a lot. It could be a simple electrolyte imbalance. If neurologic, the nerves can be tested easily.