Will doing random exercises throughout the day make any difference?

I'm on a health kick and I'm eating clean and exercising. I generally go to the gym everyday, but while I'm watching a movie or before bed or whatever, I'll do random exercises. Might be seated pull ups, crunches, squats - whatever. Will doing 30-50 reps randomly of these make any difference or am I just wasting time and energy?

Thanks!
Will doing random exercises throughout the day make any difference?
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