Could you please put the red in simple English?

[v0031]

California hotel offering 'Mermaid Fitness' workouts
A California hotel is offering a unique exercise class designed to build core strength -- "Mermaid Fitness" sessions in the hotel pool.
The Hotel Del Coronado in San Diego is offering Mermaid Fitness classes on Fridays and Saturdays in the accommodation's Beach Village pool.
The $25 price for each class includes rental of a mermaid tail -- participants who buy their own tails pay only $10 per class -- and a 45-minute mermaid swimming session.
The hotel describes the class as a "fusion of swimming, core, cardio and strength training set to upbeat music."

[Lechasseur]

The part in red means upbeat music (music that makes you want to move) will be played during these activities.

[v0031]

I know it's an elliptical sentence, but I don't know the full sentence.
The hotel describes the class as a "fusion of swimming, core, cardio and strength training set to upbeat music."

[dax00]

The class activities include: swimming, core training, cardio training, strength training.

[v0031]

Is this the full sentence?
The hotel describes the class as a "fusion of swimming, core, cardio and strength training which is set to upbeat music."

[wxtransit]

Is this the full sentence?
The hotel describes the class as a "fusion of swimming, core, cardio and strength training which is set to upbeat music."

The class will have swimming and other exercises that will have peppy music in the background.

[Kamala]

Also, in the sentence, "which" should be replaced with "that."

If I recall correctly, "which" is used with a comma, while "that" is used without.


Example:

"My favorite soup is minestrone, which sometimes contains pasta."

"My favorite soup is minestrone that contains pasta."

These sentences also vary a little in meaning - the first is merely descriptive, while the second explains that my favorite soup is minestrone with pasta, implying that minestrone without pasta is not my favorite.