The pursuit of extremely stimulating activities can indeed bring short-term rapid heartbeat, but such activities are often accompanied by high risks, and one needs to carefully evaluate one's own conditions and potential consequences. The following are some legal and relatively controllable limit options, but please be sure to be prepared for safety and professional guidance.： ###1. Physiological stimulation (professional guidance required) 1. **Skydiving/wingsuit flying** -The adrenaline rush of free fall, but you need to complete professional training (such as a USPA certification course). The mortality rate of wingsuit flight is extremely high, and it is only recommended for experienced skydivers to try it. 2. **Deep-sea diving (technical diving)** -Face the risk of nitrogen intoxication, decompression sickness, etc. when exploring shipwrecks or caves. You need to obtain advanced certifications such as PADI TecRec, and never dive alone. 3. **Volcano Skateboard (Nicaragua)** -To slide down the gray slope of an active volcano at a speed of 90km/h, you need to wear special protective equipment, which is only provided by a few operators. ### 2. Psychological challenges 1. **48-hour survival experiment** - Try to be alone in the wilderness (no communication/food) under the supervision of professionals, the risk of psychological collapse is much higher than physical injury. 2. **Horror Experience Hall (Extreme Version)** -Such as Japan's "Most Feared Hospital" or McKamey Manor in the United States (an exemption agreement is required), it may cause post-traumatic stress disorder. ###3. Alternative solutions 1. **Competitive sports** -Pole dance aerial skills, motorcycle track days, white water rafting (Class V), etc., the risk is controllable and the skills can be systematically improved. 2. **Sensory deprivation experiment** -Floating cabin + hallucinogenic music combination experience, which may cause hallucinations similar to near-death experiences (professional supervision required). ### Important reminder： -Physical examination (especially heart examination) is required before all high-risk activities -Avoid acting alone and choose an operator with UIAA/ISO certification -Consider trying VR extreme experiences (such as "The Climb 2") to test endurance first Psychological studies have shown that the continuous pursuit of extreme stimulation may be due to disorders of the dopamine system. If it is accompanied by symptoms such as insomnia and impulsive consumption, it is recommended to be screened for ADHD first. The true "feeling of being alive" often comes from the mental experience of being deeply involved in a certain field (such as rock climbing and free diving), rather than simply pursuing danger. Are you more inclined to challenge your physical limits or break through your psychological fears? Different tendencies will have completely different recommended paths.