What you need
Browser and Stereo Mix
Towermax Fitness Membership (is free) to login as member
Firefox or Chrome Browser
For capture sound you need the Stereo Mix activated or Software for capture your computer sound.
Enable Stereo Mixer
You need activate Stereo Mix on your PC. Stereo Mix is a tool which enables you record the sound that your computer is outputting.
For open the Sound Control Panel you can do it the 1(a) or 1(b) way.
1(a). Select Start > Settings > System > Sound > Sound Control Panel (right side)
1(b). Press Win + R to open Run windows, and then input mmsys.cpl and click OK to open Sound settings.
2. Go to Recording tab. If there is no Stereo Mix option, you need to right-click any empty place in the windows and check Show Disabled Devices and Show Disconnected Devices options.
3. Right-click the Stereo Mix and select Enable.