I would like to do multiple workouts throughout the day (let's say 4-8 times) when I'm at work. My office has a gym with free weights. The workouts can be from 5-10 minutes long.
I know the importance of taking frequent breaks, but either walking or doing stairs doesn't seem sufficient for my upper body. I still get stiff shoulders/neck even though I'm taking these frequent breaks.
I also do real workouts outside of work, 4 days out of the week.
So my question is, what sort of plan would be effective irrespective of stiff shoulder/neck? I don't see too much material, if there is anything it's usually these body weight exercises that only seem good for someone who isn't in shape or actually lifts weights.
What would be better than a stiff shoulder/neck than lifting weights? Maybe stretches would be better?