You can find a platform to carry it, as above. You can put a barbell around your neck if you can. If your back is strong, you can put a 120 kg barbell on it. Too much is harmful to your health. Do back abdominal muscles and practice both back muscles.
When your abdominal muscles are outlined, you can hang your body upside down and do sit-ups with your hands off the ground. The effect is obvious, but it is not advisable to do more. Head-down will produce symptoms of hypoxia. 50 is the best!
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