Most people who answer this are going to say "if a human can do it, its not superhuman" I feel that is obvious so instead I'll explain how to be able to lift abnormally large amounts of weight. You will mainly want to focus on "the big three". Squats, bench press, deadlift. Body building will get you big and eventually strong but powerlifting is what you wanna do to get super strong. You basically want to do a little bit less then the maximum weight you can lift and do 4 sets of 3 reps. Google powerlifting or strongman training 4 more tips.......
spinach
super strength
Since mermaids are ficitious creatures they can have whatever abilities the person writing about them wants them to have. In most stories, though, they do not have superhuman strength.
Superhuman strength; maximum capacity unknown; superhuman endurance and resilience; super leaping.
Robin is a peak human without superhuman strength.
Speed and Strength
Laser Eyes
As most Greek gods are, well, gods, yes they have "superhuman" powers, including strength. To a Greek god or goddess, moving a mountain isn't hard.
There is a new hypnosis MP3 that is gaining in popularity called "Ultra Human Hypnosis." It's supposed to unlock your superhuman powers, 'superhuman strength' being one of them. Just search "Ultra Human Hypnosis" and you will find it.
As most Greek gods are, well, gods, yes they have "superhuman" powers, including strength. To a Greek god or goddess, moving a mountain isn't hard.
Hercules' principal power is his superhuman strength.
Adrenalin