David Beckham surprised fans on Monday with the launch of his very own workout routine with fitness studio F45, known for HIIT style, sweat-inducing sessions.MORE: David Beckham 'third wheels' son Romeo and girlfriend Mia Regan's intimate date nightThe father-of-four announced his new venture alongside a video on Instagram of him performing box jumps, high knees, weighted lunges and burpees. Victoria Beckham was among the many of David's followers to comment on the post, writing: "Do I need to start this?!?"WATCH: David Beckham gives an insight into his training routineActor Mark Wahlberg, who is known for his own intense workout schedule, weighed in too, posting four flame emojis.MORE: David Beckham's wife Victoria models rarely-seen original engagement ring - photoSEE: Victoria Beckham shares unseen glimpse into her bedroom with David Beckham at £6m Cotswolds homeDavid, who created the platform with F45 trainer Gunnar Peterson said the workout was inspired by his football career and shared that he couldn't wait for his followers to try it.He also posted a clip of the workout in action, soundtracked to Work B**** by Britney Spears – the ultimate workout motivation track.