Jimmy Floyd Hasselbaink has won three of his first 15 matches in charge at Queens Park Rangers.
Angella has been at QPR for the entirety of the season so far, after joining from Watford in the summer transfer window.
The Italian defender has already experienced three different managerial regimes during that time, with Chris Ramsey and Neil Warnock both spending time at the helm before Hasselbaink took over.
And Angella believes that the Dutch boss has made some positive changes to his predecessors.
“With (Chris) Ramsey we didn’t train a lot. We only had Neil Warnock in charge for a few weeks, so it is hard to judge him,” he said.
“He (Hasselbaink) changed a lot of the sessions up. We trained more and a lot harder.
“He takes time out with the players who are not in the team on the training ground and pulls them to one side, which is nice too.”
Angella actually found it difficult to break into QPR’s team during the initial stages of Hasselbaink’s reign.
However, the Watford loanee has now started in QPR’s last two matches - against Sheffield Wednesday and Birmingham City - and he has impressed.
Angella has helped QPR pick up four points from their two matches against the play off contenders.
QPR are now in 11th place in the Championship table, with their next match coming against relegation threatened Milton Keynes Dons.