When does ur arteries constrict? and if u do 10 pushups that is super hard for u, the blood pressure will go very high in an instant rigtht?

Constrict/Instant?No: The microscopic end arteries, arterioles, constantly adjust size, over wide range, under both brain control & local feedback, every sec, 24/7. This controls local blood flow, distribution of heart output & (combined with heart output) BP, moment-to-moment 24/7. Any usual BP reading is from only a single heart beat for top, another for bottom number. Usually visible arteries vary in size minimally.