It seems like "do stretching" is more commonly used than "do stretches." Is that right? Which one sound better? I want to know which one is used normally. Plus, are both of these grammatically correct? Or, perhaps do these have some differnces in meaning?
What I want to express is that when I go to the gym, I do some stretches(or stretching[uncountable noun]) for warm-up.
What I have written down is "I start with 5 minutes of walking for warm up, and do some stretching from head to toe then, I begin my strength training."
If there are more parts that sound awkward in the sentence, i would be very grateful to know.