Yoga can be a helpful tool for weight loss, but it's important to approach it as a holistic practice that includes not just physical movement, but also mindfulness, breathwork, and a balanced diet. A yoga challenge to lose weight might involve committing to a regular yoga practice, incorporating more movement into your daily routine, and making healthy food choices. Additionally, setting achievable goals and tracking progress can help to stay motivated and on track. However, it's important to remember that weight loss should always be approached safely and sustainably and to consult with a healthcare professional before making any significant changes to your diet or exercise routine.