Billion-dollar ideas

In no particular order, some billion-dollar (jk, these are worthless) ideas I've had this week:

• Seatbelts for rowing machines
• Aesthetic gym equipment / weights
• Attaching a vacuum cleaner to the bottom of the sled drag and the prowler to, you know, clean the track 
• A gym video game app because so many people are nervous about going to the gym and being embarrassed about not knowing how to use the equipment, a simulation game would really help