Statistics are used in Grand Theft Auto Series games to indicate the current level of progression in that statistic.
In GTA San Andreas, the Fat statistic indicates CJ's current "extra" weight.
For every 150 seconds of running, or every 100 seconds of biking or swimming, you will shed 1.5% fat. At a gym, this is much faster; on the treadmill or stationary bike, you will shed 2.5% fat every 14 seconds. When lifting weights, you will shed 2.5% fat for each repetition. Also, if you wait 48 hours between meals, you will shed fat at a rate of 2.5% per hour. If you engage in any of these activities with a completely depleted fat stat, it will instead burn Health.
Gyms are available for CJ to work out and increase his Muscle. Using the treadmill or stationary bike for 14 seconds will gain 1% muscle. Lifting weights, you will gain 1% muscle for each repetition.
150 seconds of running in-game, or 100 seconds of swimming or biking, will cause you to gain 1% muscle.
In GTA San Andreas, the Respect statistic allows you to recruit gang members.
In GTA San Andreas, the Stamina statistic indicates endurance in regards to running, swimming, and cycling.
For every 150 seconds of swimming, or every 300 seconds for running or biking, you will gain 5% Stamina. At the Gyms, the treadmill and stationary bike bike will grant you 4% Stamina for every 14 seconds.