Strength is required to complete certain questlines as well as help you pass your gym class.

How To Gain Strength

You will need to play the strength mini-game at the gym by selecting the weights bench to improve your strength. Unfortunately, you need someone to spot you before you can do this so you will need to get Kevin's help.
Once you've unlocked Kevin and clicked on the weight bench to start the mini-game, the game will instruct you to mash the space bar to fill the bar but bugs currently mean that holding down the space bar works far better.

How to Unlock Kevin

Talk Kevin in the Cafeteria at School who will offer to spot you if you can get someone to cover him working in the cafeteria.
Then you need to talk to Erik at his house and ask if he would be willing to stand in for Kevin and he says he will if you buy him the Sea Dogs video game.
Head to the Mall and go to the Cosmic Store to purchase the game. Return to Erik's house to hand over the game and he will oblige. - This may not work if you have another quest with Erik currently active. Try coming back at night if you have troubles.
Head back to Kevin in the school cafeteria and explain that his work has been taken over. Now he will be available to spot you while you lift weights.

Quests That Need Strength

  • Dianne's storyline
  • French Class (To use the printer)
  • Gym Class
  • Ronda's storyline
  • Jenny's Storyline