The coaching staff of the national team cannot be involved in the physical training of the players. This is the responsibility of the club coaches.
One of the most important tasks of the national team's coaching staff before a major tournament is to prepare the players physically in such a way that they reach their peak during the decisive stages. This is exactly what Hiddink and Verheijen did with the Russian national team in 2008. So, you're wrong.
Before this championship, Advocaat introduced single training sessions (all other national teams trained twice a day); thanks to their freshness, they convincingly defeated the Italians and the Czechs, and in the second half against the Poles, they were already crawling...