The three types of Sankharas
1. Bodily fabrications/mental formations(kaya sankhara)* The example given in sutta is in and out breathing. This is the thought when the mindfulness of breath is fully immersed in the body.
2. Verbal fabrications/mental formations (vachi sankhara).** This is vitakka-vicāra in Pali or translated to English as applied and sustained thought or directed thought & evaluation.
3. Mental fabrications/formations (citta sankhara).*** These are thoughts of perception and feeling.