Shoulder exercises

It really depends how quick your body responds. For me hitting a platue can take 4 months, but I work out different body parts and change almost every week. If your hitting the same routine every week, then I say no later than 3 months but only if you have reached your maximum potential from that exercise for the muscle group.

 

Thanks Guys,
I thought I needed to change every 3-4 weeks or so

 

You may need to. Everyones different. Nothing wrong with changing as often as you'd like.

 

how do you know when you need to change it up?

 

1. No visible changes
2. regression of strength & Stamina
3. increase in body fat composition by using an Omron or other electric devise to measure lean muscle mass.

Muscles have a memory and it if your routine remains the same without a "shock" it expects and adapts not allowing progression.