Перед уроком в йога-студии все переобуваются и оставляют обувь у стены.

Because перед usually requires the instrumental case.

So:

• урок = lesson
• уроком = instrumental singular of урок

In this sentence, перед уроком means before the lesson.

A useful thing to remember is that перед can mean either:

• before in time: перед уроком = before the lesson
• in front of in space: перед домом = in front of the house

In both meanings, it normally takes the instrumental case.

Because after в meaning in, when talking about location, Russian uses the prepositional case.

So:

• йога-студия = yoga studio
• в йога-студии = in the yoga studio

The noun студия changes to студии in the prepositional singular.

Also, йога- here works like the first part of a compound noun, similar to бизнес-центр or интернет-магазин. The part йога does not change here; the main noun студия is the one that declines.

Because все can mean different things depending on context.

Here, it stands alone and refers to people:

• все переобуваются = everyone changes shoes / everyone puts on different shoes

If it modifies a noun, it usually means all:

• все люди = all people
• все книги = all the books

So in this sentence, все is best understood as everyone.

Because все here means everyone, and in Russian it takes a plural verb.

So:

• все переобуваются
• все оставляют

Even though English everyone is grammatically singular, Russian все behaves differently here and uses plural verb forms.

Переобуваются comes from переобуваться / переобуться, which means to change one’s shoes.

It is built from:

• обувь = footwear / shoes
• the verb idea обувать(ся) = to put shoes on
• the prefix пере- = re-, change over

So переобуваться is not just taking shoes off. It specifically suggests changing into different shoes, for example from outdoor shoes into indoor shoes or slippers.

That fits the context of a yoga studio very well.

The ending -ся is a reflexive marker, but in Russian reflexive verbs are not always directly translated with oneself.

Here, переобуваться means something like:

• to change one’s shoes
• literally, roughly, to re-shoe oneself

Russian often uses reflexive verbs for actions people do to themselves or for their own state/change.

Compare:

• одевать кого-то = to dress someone
• одеваться = to get dressed

Similarly:

• переобувать кого-то = to change someone’s shoes
• переобуваться = to change one’s own shoes

So the -ся tells you the people are doing this to themselves, not to someone else.

Because обувь is the direct object of оставляют, so it is in the accusative case.

The important detail is that обувь is a feminine noun ending in a soft sign, and for this noun the accusative singular looks the same as the nominative singular:

• nominative: обувь
• accusative: обувь

So the form does not change, even though the case function does.

Also, обувь in Russian often means footwear/shoes as a collective idea, so singular обувь can naturally correspond to English shoes.

Because обувь is a collective/uncountable-style noun meaning footwear.

Russian often uses:

• обувь = footwear / shoes in a general sense
• туфли, ботинки, кроссовки etc. when you want to name a specific type of shoes

So оставляют обувь у стены means leave their shoes/footwear by the wall.

This is very natural Russian. English often prefers the plural shoes, but Russian does not have to match that exactly.

Because у means by / near / next to, and it requires the genitive case.

So:

• стена = wall
• стены = genitive singular
• у стены = by the wall

This is a very common pattern:

• у окна = by the window
• у двери = by the door
• у дома = by the house

So оставляют обувь у стены literally means leave the footwear by the wall.

Not here.

У basically means by, near, at. It shows location, not movement away from something.

So:

• обувь у стены = the shoes are by the wall
• оставляют обувь у стены = they leave the shoes by the wall

If you wanted from the wall, Russian would use something else, such as от стены.

Because Russian often uses the present tense to describe a habitual action or a general rule.

So this sentence means something like:

• Before the lesson in the yoga studio, everyone changes shoes and leaves their footwear by the wall.

It is not necessarily about one specific lesson happening right now. It describes what people normally do there.

This is very common in both Russian and English when talking about routines.

Because Russian often leaves possession understood from context when it is obvious.

Here, if everyone changes shoes and leaves footwear by the wall, it is clear they are leaving their own shoes.

Russian does not need to say свою обувь unless there is a reason to emphasize or clarify it.

So both are possible:

• оставляют обувь = leave their shoes / leave footwear
• оставляют свою обувь = leave their own shoes

The version without свою sounds more neutral and natural here.

The word order is natural, but Russian word order is fairly flexible.

This version is structured like this:

• Перед уроком = before the lesson
• в йога-студии = in the yoga studio
• все = everyone
• переобуваются и оставляют обувь у стены = change shoes and leave footwear by the wall

It sounds like a neutral description of what happens there.

You could move parts around for emphasis, for example:

• В йога-студии перед уроком все переобуваются...
• Все перед уроком в йога-студии переобуваются...

These are still understandable, but the original order is smooth and natural.