Because it is an attacking stroke and will have more speed and harder to handle than the block.
All the best,
Alois Rosario
www.pingskills.com
On 19/09/2014, at 9:08 AM, BS Thụy <nvthuy64@yahoo.com> wrote:
Many thanks
Thuy
Đã gửi từ iPhone của tôi
Ngày Sep 19, 2014, vào lúc 4:53 AM, Alois...