Strength is required to complete certain questlines as well as help you pass your gym class.
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.
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.
- Dianne's storyline
- French Class (To use the printer)
- Gym Class
- Ronda's storyline
- Jenny's Storyline