Wales boss Chris Coleman says the speed and fluidity of Liverpool's attack would be hard for any defence to deal with.
Goals from Roberto Firmino and James Milner gave the Reds a hard-fought 2-1 win over Swansea City at the Liberty Stadium – their fourth straight victory in the Premier League.
Speaking on Sky Sports, Coleman said Jurgen Klopp's side deserved to win for their improved performance in the second half after failing to register a single shot on target in the first 45 minutes.
"They had better movement in front of the ball, getting [Philippe] Coutinho on it more, playing give-and-gos and one-twos," the Wales manager said.
"The ball speed was much faster, one and two-touch football, and when they get that type of movement it's hard for any defence to deal with it. It looked like it was only a matter of time before they got the breakthrough.
"They'd hunt together, win it, and then they're off four, five, six of them. They're quick and good with the ball, and that's a recipe for disaster for any defence. I'd like to see what he does in training, because if you play like that, at breakneck pace every game, two times a week, you're doing next to nothing in training," he added.
The win at Swansea helped Liverpool climb to second spot on the Premier League table, two points behind leaders Manchester City, who have a game in hand. The Reds' next league assignment sees them taking on arch-rivals Manchester United at Anfield after the international break on 17 October.
Former Liverpool striker Dean Saunders said Klopp's side would get fitter the more they play with high intensity.
"The more you play like this the fitter you get. When he first came to the club, I don't know if you remember how many hamstring injuries they had, because of the work rate going up," he told Sky Sports.
"The fitness levels go up if you play like this, with the ground they've covered."