If you see files like .7z.001 , .7z.002 , you must have all parts in the same folder. Right-click only the first part ( .001 ) to extract the entire set.
You cannot open a .7z file with standard Windows "Compressed (zipped) Folder" tools. You will need one of the following: CD-YOGA-5.7z
Video routines (MP4, MKV) or instructional audio (MP3). If you see files like