In the new era of artificial intelligence (AI) and the Internet of Things (IoT), big data collection and analysis for intelligent sports are of great importance in monitoring human health. Herein, naturally, biodegradable triboelectric nanogenerators (NB-TENGs) are developed based on low-cost, recyclable, and environmentally friendly corn bracts, which are further applied in neck motion recognition. Three NB-TENGs are integrated into an elastic collar to create a neck-condition monitoring triboelectric sensor (NCM-TS). An intelligent behavioral monitoring system is achieved by combining NCM-TS with a deep learning model, which allows the recognition of four types of neck motion with an average accuracy of 94%. The developed neck motion monitoring sensor has broad potential applications in sports health monitoring, rehabilitation training, and healthcare.