Susi B Thank you for your great questions. In quarter sun salutations the spine is lengthening as you inhale, reach your arms up. During the Swan Dive, as you fold forward the spine is extending. Make sure to bend your knees as you’re folding forward to support the lower back. I hope this helps to clarify. Please let me know as any other questions arise during your practice. So happy you are here! Love, Alana