If you were transformed into a “Super Human”, how could you safely test the limits of your strength and invulnerability?

strength: start gradually lifting heavier and heavier objects, like cars or trucks. maybe wander onto a construction site to see if i can lift tons of concrete etc. if possible, punch a durable object, measure the distance it travelled, and extrapolate the force

invulnerability: idk i’m pretty impulsive i might just shoot myself in an extremity and see what happens