Pic Special: Portugal Tour - Day Five
After a day of rest on Sunday, United's stars were back onto the training pitch on Monday morning for arguably the toughest session of their Portuguese pre-season training camp to date.
A warm-up was followed by a number of running drills, working across small areas but at high intensity, and the work rate and effort from the squad was clear to see.
Defender Massadio Haidara - who linked up with the squad over the weekend - worked away from the main group with physio Derek Wright, while goalkeeper Tim Krul continued his rehabilitation from shoulder surgery.
And after a quick drinks break to rehydrate themselves in the morning heat, it was on to an outdoors strength and conditioning session.
Capturing it all on camera for nufc.co.uk was Managing Editor Anthony Marshall.