It's 6am and I arrive at Wexham Park Hospital to follow the paramedics working for South Central Ambulance Service.
The idea is to get an insight into their working day and the pressures they are facing, like many other frontline workers in the NHS.
A call comes in immediately and we head for Maidenhead, weaving through traffic with the siren and flashing blue lights on.
When we arrive at the property we meet Shirley Pask, who is having difficulty breathing. She is a priority and is in a critical condition with suspected pneumonia.
The paramedic I am with, Kelly Brunton, tells me that in ambulance terms this is a "scoop and run". They need to get the patient to the hospital as quickly as possible.
The paramedics are clearly under pressure. All day there are back to back call-outs.
We attend to people with fractures, mental health issues, stomach complaints and respiratory problems.
While many patients we visit could have been treated by their GP, others should have called an ambulance sooner.
Kelly, who has been in the job for six years, said: "It is difficult. We are very busy ... earlier, a patient got stood down from us for a patient that was more seriously unwell, so it left us not knowing how long it would be until they could get an ambulance, which can be quite distressing."
Indeed, later on we got to a patient who had been waiting all day for the paramedics to arrive.
Joan Sakal, 83, has had a fall and is thought to have fractured her ankle.
Clearly in pain she cannot put any weight on her leg. Kelly decides that Joan needs an x-ray and manages to book her into her local hospital.
Ms Sakal said: "I waited for a wee-while before calling an ambulance, in case it went away. I've been waiting all day. It is not their fault because they're busy, busy, busy - but I'm here now."
Throughout our 10-hour shift, we travelled across South Central's patch, which covers Hampshire, Buckinghamshire, Berkshire and Oxfordshire.
We saw a variety of patients - but all day one of them stayed at the forefront of my mind - Shirley.
She had been in a bad way when we met her and we weren't sure if she would pull through.
We later met up with her husband who said he had feared the worst when the doctors told him to get his children to the hospital.
Thankfully she pulled through and is now recovering.
My day with paramedics at South Coast Ambulance Service has shown me just how much pressure they are under.
With an ageing population, the demand for their services is higher than ever before.
Some patients may have to wait hours for treatment - but for those who are critical, like Shirley, they owe their lives to the dedication of the workers.
(c) Sky News 2017: NHS under pressure: A day in the life of a paramedic