In a more action - adventure take, the girl could be a spy or an undercover agent who was captured by the enemy. They tied and gagged her near a treadmill as a way to keep her captive. The story could be about her using her skills to break free and complete her mission.
It might be a horror - themed story. The girl is tied and gagged, perhaps by some deranged person. The treadmill could be part of a sadistic plan, like she is forced to be near it for some psychological torture. The story could then be about her struggle to escape this terrifying situation.
I don't think it's a common type of story. Most stories follow well - known genres and tropes. This 'girl tied gagged treadmill story' seems more like an out - of - the - box idea that might be found in very specific or experimental forms of literature or perhaps in some off - beat independent films.
In a more action - adventure context, perhaps the girl is a spy who has been captured by the enemy. The tying and gagging on tiptoes is a form of torture or interrogation technique. But she is a strong - willed character, and she uses her wits and any available resources around her to outsmart her captors and escape.
One possible plot could be a mystery thriller. The girl is tied and gagged during a webcam session, and it's part of a ransom situation where the kidnappers are using the webcam to send messages to her family for money. Another could be in a horror context, where she is a victim of a deranged person who likes to terrify his victims on webcam.
Perhaps it's part of a prank that has gone too far. Some irresponsible people might think it's funny to play such a cruel 'joke' on her without realizing the seriousness of their actions. However, this is still a very wrong and illegal behavior.
Maybe she's a hostage in a robbery gone wrong, and the key is to the locked door where the robbers have stashed their loot. If she can free herself, she can alert the police.
One possible story could be in a mystery or thriller context. Maybe the girl is a witness to a crime and the criminals tie her up and sock - gag her to keep her from screaming or alerting the police. Then, a brave hero comes along to rescue her.
In a horror movie, it could be that the girl is a victim of a deranged killer. She might have witnessed something she shouldn't have, and the killer ties and gags her to keep her from escaping or screaming for help. Then he could be planning some sort of ritual sacrifice or just toying with her before finally killing her.
One possible story could be a mystery or thriller plot. Maybe she was kidnapped by a villain who used the tube sock to gag her and tied her up to keep her from escaping while they searched for something she had. It could also be part of a role - playing game in a fictional adventure where she was captured by 'bad guys' in a make - believe world.
One possible story could be that she is part of a magic show. The magician uses the tied mask as a prop for an escape trick. The girl is a volunteer, and the gagged mouth adds to the mystery and drama of the performance as the audience watches in anticipation to see how she will free herself from this situation.
If it's safe to do so, you can try to untie her gently while waiting for the police. But make sure not to destroy any evidence that might be on the ropes or gag. You can also talk to her softly to keep her calm.