No, according to the provided rules, knees are forbidden in this specific style of kickboxing.
Based on the supplied reference, this form of kickboxing has specific regulations regarding permitted strikes. It's crucial to understand these rules to determine the legality of knee strikes:
- Permitted Strikes: Punches and kicks above the waist are allowed.
- Forbidden Strikes: Elbows and knees are not allowed.
Therefore, in this style of kickboxing described, using knees is illegal.
