Last month, individuals and groups pumped out 3046 pushups over 21 days to acknowledge the Australians whose lives were lost to suicide in 2018.

Using Facebook to share highs and lows on their knees and toes, more than 4000 people signed up to fundraise for the Braddon-based centre.

Headspace coordinator Tracy Boomer said the response to the challenge had been overwhelming.

"We've been blown away by the generosity of people during such a difficult period," Ms Boomer said.

"It's been heart-warming to see so many people get involved."

Across Australia, more than 1 billion push-ups were recorded throughout the challenge.

So far, more than $4.8 million had been raised nationally, with that figure expected to increase as donations remained open throughout June.

Ms Boomer said all money raised for Headspace Canberra would go back into providing support and services to young Canberrans.

"It's been a really tough year for local young people - first the bushfire crisis and now COVD-19 and all the financial and mental health implications it brings. These donations have come at a crucial time," Ms Boomer said.

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"It was incredible to see so many local businesses and community members get involved in the Push-Up Challenge, it proved to be a great event to hold virtually that brought many people together."

A combined crew from MTP Services and Cordelta Canberra were among the biggest fundraisers in the ACT. More than 30 people raised more than $6660 by completing more than 85,000 push-ups.

Team Mickey Finn raised more than $3500 and students from Melrose High School performed 1625 push-ups to raise $660.

Headspace Canberra has provided free or low-cost services for 12-to-25-year- olds since 2018.