Cape Town - Former Springbok coach Peter de Villiers has his own theory on why the Boks lost their last two games in the Rugby Championship.
The Springboks conceded late tries in Brisbane and Johannesburg to fail against the Wallabies and All Blacks in their first two Tests of the competition.
De Villiers, who coached the Boks between 2008 and 2011, was quoted as saying by AFP: "We need to address the fighting-fit weight of the players so that they can last for 80 minutes," said De Villiers.
"The players are carrying excess unnatural weight which is why we cannot maintain intensity for full matches.
"I believe we bulk up our Springboks instead of making them match-fit."
The Boks tackle Argentina in their final Rugby Championship campaign in Durban on Saturday.
Kick off is at 17:05.
15 Willie le Roux, 14 Jesse Kriel, 13 Jean de Villiers (captain), 12 Damian de Allende, 11 Bryan Habana, 10 Handre Pollard, 9 Ruan Pienaar, 8 Schalk Burger, 7 Marcell Coetzee, 6 Heinrich Brussow, 5 Lood de Jager, 4 Eben Etzebeth, 3 Vincent Koch, 2 Bismarck du Plessis, 1 Tendai Mtawarira
Substitutes: 16 Adriaan Strauss, 17 Trevor Nyakane, 18 Marcel van der Merwe, 19 Pieter-Steph du Toit, 20 Siya Kolisi, 21 Cobus Reinach, 22 Pat Lambie, 23 Lwazi Mvovo
15 Joaquín Tuculet, 14 Horacio Agulla, 13 Marcelo Bosch, 12 Jerónimo De la Fuente, 11 Juan Imhoff, 10 Juan Martín Hernández, 9 Tomas Cubelli, 8 Leonardo Senatore, 7 Juan Manuel Leguizamon, 6 Pablo Matera, 5 Tomás Lavanini, 4 Guido Petti, 3 Nahuel Tetaz Chaparro, 2 Agustín Creevy (captain), 1 Marcos Ayerza
Substitutes: 16 Julián Montoya, 17 Lucas Noguera, 18 Matías Díaz, 19 Matías Alemanno, 20 Tomás Lezana, 21 Martín Landajo, 22 Santiago Gonzalez Iglesias, 23 Lucas Gonzalez Amorosino