Personal digital fitness and health coach platform, WHOOP, has raised $200m in fresh funding.

The Series F round values the Boston based firm at $3.6bn.

It was led by SoftBank Vision Fund 2, alongside IVP, Cavu Ventures, Thursday Ventures, GP Bullhound, Accomplice, NextView Ventures, and Animal Capital.

The company said it will use the fresh capital to invest in research and development, enhance its existing products and services and expand into additional new markets.

WHOOP's international expansion is to be driven from its office in Dublin.

"We are thrilled to deepen our partnership with SoftBank as we grow internationally," said Will Ahmed, WHOOP Founder and CEO.

"While we have experienced amazing growth in the past year, the potential of our technology and the vast market for health monitoring remains largely untapped."

WHOOP makes a round the clock digital fitness tracking and health coach system that provides feedback on sleep, recovery and strain.

It claims it is now the most valuable standalone human performance company in the world.

The business has over 500 employees and has taken on 225 new staff in the past 12 months.

In total it has raised approximately $400 million.

Irish athletes such as Conor Murray, Kerry GAA's David Clifford and Cork Camogie’s Amy O’Connor, wear and use the product already.