Just under half (42%) of workers felt positive relationships helped them to feel good at work, compared with a mere 14% for hitting their targets.
In the survey of more than 1,400 workers, having a good work/life balance was the second (40%) most common reason for feeling good at work, followed by receiving praise (26%) and earning the trust (16%) of their boss.
The survey also revealed only 4% of workers felt team activities including 'away-days' made them feel good at work.
Mark Day, spokesperson for Simplyhealth said: "Positive working relationships and feeling good while at work are really important when looking at overall employee health and wellbeing.
"Organisations with healthy, happy employees can find they see improvements in productivity and results."
Rachel Kirby Rider, Samaritans' director for fundraising and communications, said: "The survey results demonstrate how looking out for each other's wellbeing and having a good work / life balance is essential."
