No endurance. No fitness. Simple.
After scoring a 100, it's like our batsmen have been made to walk the whole world on foot. Whereas guys like Shiv/Samuels/Clarke score 200 like it's not a big deal.
And after bowling a few overs where nothing is happening, our bowlers,fielders and captain just go through the motion. That is why, the dropped catches from Junaid, Naeem and in the morning session when Samuels was dropped.