Wanting to change experiment

I want to change my experiment to something completely different since my toilet paper absorbency experiment isn't suitable
I'm think about doing:

The effect of Gatorade Vs. Water on year 10's Pulse Rates while Exercising
The Independent Variables include:
- the age of the yr 10's : 15 or 16 year olds
- the method and amount of time the pulse is taken for
- amount of time exercising and resting
- types of exercises

The Dependent Variables include:
- whether or not Gatorade was consumed prior to exercise

Method:
(make sure parental permission is obtained in writing for all yr 10s)
1. Pour 250mL of Gatorade into each paper cup
2. Have each student drink each 250mL cup of Gatorade
3. Wait approximately 30 minutes
4. Take resting pulse rates of each person at the carotid artery on the neck and record results
5. Have each person do 8inch step ups for 4 minutes
6. Take pulse rate and record
7. Repeat steps 1-6, this time with different exercises- running on the spot and sit ups
8. Repeat steps 1-7, this time with water, not Gatorade on a different day

Which Brand Of Toilet Paper Is Most Absorbent?

Variables to consider:

Dependent Variable:
The amount of water put in each beaker
Independent variable:
The amount of toilet paper used
Controlled Variable:
The amount of time the toilet paper is left in the container

Equipment:
4 different brands of toilet paper, 4 containers, water, measuring cup, tweezers

Hypothesis:
The more expensive brand of toilet paper will absorb more water than the cheap brand of toilet paper in a short amount of time

Aim:
To determine whether the expensive brand of toilet paper or the cheap brand of toilet paper absorbs the most water in a short amount of time

One method that can be used:

1. Put all the equipment listed on a table
2. Pour 20mL of water into each container
3. Tear off one square piece of toilet paper, making sure each has the same area
4. Put each square into a separate beaker at the same time
5. Record which toilet paper brand was put into which container
6. Leave toilet paper in for one minute
7. Use tweezers to pull out each toilet paper at one minute
8. Measure and record how much water is left in each beaker with a measuring cup
9. Repeat steps 3-8 three more times, this time using 50mL of water, 70mL of water and 90mL of water

IDEAAAS

things I'm planning to research and investigate in:

1. which toilet brand is best for absorbing the most water
- planning to get multiple brands of toilet paper, then putting them into the same amounts of water. I will then take the toilet paper out and see how much water is left. The one with the least amount of water left would then obviously be the toilet paper that absorbs the most water.

2. which apple browns faster

3. what colour candle burns faster