yújiā tuántǐkè zài gēngyīshì fùjìn.

Yes, 瑜伽团体课 can be understood as one noun phrase: yoga group class/classes.

In Chinese, one noun often directly modifies another noun without 的, especially in short, common combinations like:

• 中文老师 = Chinese teacher
• 网球课 = tennis class
• 瑜伽团体课 = yoga group class

Using 的 here would sound less natural in an ordinary sign or simple statement.

The pattern is:

[thing/event] + 在 + [place]

So here:

• 瑜伽团体课 = the yoga group class(es)
• 在 = to be located at / in / near
• 更衣室附近 = near the changing room

This is a very common way to say where something is.

Because Chinese normally uses 在 to show location.

• 是 is mainly used to connect one noun to another noun, like A is B
• 在 is used for location, like A is at/in/near B

So:

• 瑜伽团体课在更衣室附近。 = The yoga group classes are near the changing room.

Using 是 here would not be the normal basic way to say it.

附近 means near, nearby, or in the vicinity.

It usually comes after a place noun:

• 更衣室附近 = near the changing room
• 学校附近 = near the school
• 地铁站附近 = near the subway station

So 在更衣室附近 means near the changing room.

Normally, no. The most natural form here is:

• 在更衣室附近

You may sometimes see 的 in other contexts, but for a simple location phrase, learners should treat place + 附近 as the standard pattern.

So:

• 更衣室附近 = natural
• 更衣室的附近 = usually not the best choice for a basic sentence like this

团体课 means a group class or group lesson.

It contrasts with a private lesson, such as:

• 私教课 = private coaching class
• 一对一课程 = one-on-one course

So 瑜伽团体课 is not just any yoga class—it specifically means a yoga class taken as part of a group.

Chinese nouns usually do not clearly mark singular vs. plural unless the context makes it clear.

So 瑜伽团体课 could mean:

• a yoga group class
• yoga group classes in general

The exact meaning depends on context.

If Chinese wants to be more explicit, it can add words like:

• 一个瑜伽团体课 = one yoga group class
• 一些瑜伽团体课 = some yoga group classes

Here are the syllables and tones:

• 瑜伽 = yújiā (2nd tone + 1st tone)
• 团体课 = tuántǐkè (2nd + 3rd + 4th)
• 在 = zài (4th)
• 更衣室 = gēngyīshì (1st + 1st + 4th)
• 附近 = fùjìn (4th + 4th)

A natural reading is:

Yújiā tuántǐkè zài gēngyīshì fùjìn.

Yes, but the structure changes a little.

Original:

• 瑜伽团体课在更衣室附近。
• The yoga group classes are near the changing room.

Another natural option:

• 更衣室附近有瑜伽团体课。
• There are yoga group classes near the changing room.

The difference is:

• A 在 B = A is located at B
• B 有 A = There is/are A at B

Both are useful, but they focus on the information differently.

It can be either, but it sounds especially natural in a sign, schedule, map, or brief informational context.

Chinese often uses short, efficient sentences like this to give location information:

• 洗手间在前面。 = The restroom is ahead.
• 会议室在二楼。 = The meeting room is on the second floor.
• 瑜伽团体课在更衣室附近。 = The yoga group classes are near the changing room.

So even though it is short, it is still a complete and natural sentence.