On Doctoring MEDLINE searches, with reference librarian comments

The question was

"Does exercise help control hypertension?"

1 :  exp Hypertension/         {44987}
2 :  limit 1 to english language         {35413}
3 :  exp Exercise/ph [Physiology]         {7186}
4 :  1 and 2 and 3          {226}

Reference Librarian comments

I like how you "exploded" and "limited" and used subheadings
("physiology"), but I found myself wishing you had discovered a very
handy subheading for set #1, which is "prevention and control."
Anyway, I tried the search myself.

1 :  exp *hypertension/pc [Prevention and Control]         {951}
2 :  exp exercise/         {13374}
3 :  1 and 2         {39}
4 :  limit 6 to (human and english language)          {35}