What does it mean when people post a workout photo or video and it has numbers on it like 132/145?

they're in cm, not inches and feet.. height/weight

height and weight. The first number is usually the individual's height in cm. The second number is usually weight, either in kg or lbs.

That means for instance, 155/90 or 155 90 means 155cm,90lbs --> for girls, smaller 2nd numbers usually means their weight in kg like 155/40 or 155 40, meaning 155cm, 40 kg. If the second number is bigger and closer to the first number like 90, 95, 100, 120, etc then it's their weight in lbs.

The same goes for men posting like 180/165 or 180 165 means 180cm, 165lbs. And 180cm/75 or 180 75 means 180cm, 75kg.

Though.... most men don't put in their weight into the post so posts that contain just one number like 185 means it's their height. 185cm.

If the post features both a man and a woman in boyfriend-girlfriend poses and there are numbers in the title, the bigger number is the man's height in cm and the smaller number is the woman's height in cm. Titles like "185/165 CP", meaning a 185cm and 165cm couple (CP means "coupling" or "couple" in Chinese internet speak). Or titles in Chinese like "185&165 情侣 Citywalk 穿搭", meaning 185cm and 165cm couple Citywalk outfits".