I love the 5x5. I think it's great for beginners all the way up to fairly advanced training. The great thing about it is that it develops total body functional strength. Also as time goes on an athlete can adapt the 5x5 to meet their changing needs (add volume if necessary, throw in a bit more accessory work, do a version with loading phase and a peaking phase, etc.). Good to see another advocate of classic 5x5 here.