No don't use this. It's too thin (10-14mm is recommended) and this kinda rope isn't smooth or comfortable at all because cotton has a lot of lint and fibres which create additional friction and rope burn (it says it's soft because it's not taking into account being around someone's neck bearing their bodyweight and motion). Go for a polyester double braided mooring line which is stronger and much more comfortable and less likely to leave marks of you practice, it also has a loop woven in so you don't need to tie a knot around your anchor point). I have both of these ropes so I know from first hand experience.
