Here are a couple of exercises that you can do to test your strength, but which also will give you strength and muscle if you practice them regularly.
Get the strongest chair handy for them, you will then be least likely to damage either the chair or yourself.
Stand erect. Raise the left leg forward and off the ground.
When executed with resistance, how a barbell with an over-grip in position across the shoulders, the hands par apart as the weights on either end will permit, or hold dumbbell extended at the right side.