After they were out-muscled and out-matched in Kingston in front of a zealously supported and physical Jamaican team earlier this month, the Proteas believes they are ready for their next challenge.The Vitality Netball Nations Cup – between South Africa, England, Uganda and Malawi – will start on Saturday at the Motorpoint Arena in Nottingham.The second half of the tournament will be played at the Copper Box Arena in London next weekend.The Proteas have already landed in Nottingham and got their training under way ahead of their opening match on Saturday against Uganda (5pm SA time).SA…