And he hopes to prove his strength at a major competition in Italy.
Classmates and staff at St Peter's Collegiate Academy in Wolverhampton will be supporting the Year 11 as he aims to become a world champion.
He will compete in the single bench press lift in the World Powerlifting Championships being held in Sardinia this weekend.
Joshua, aged 15, has recently become British powerlifting champion after competing in the British Sub Junior Powerlifting Championships. He has also qualified for the World Full Power-lifting Championships taking place in Ireland in November.
The teenager has been inspired by his father, Mak Singh, and started showing an interest in the sport at the age of only five-years-old. At that time he would deadlift the living room sofas to impress his father.
Joshua began weight-training at the age of 13 and, by the age of 14, his talent really began to show.
He said: "During the first lockdown it was difficult to train but I used heavy objects such as sacks of potatoes to lift, and did push-ups, chin-ups, free squats and skipping daily to maintain fitness levels.
"During the second lockdown, my father set up a home gym to support me with my training and dream to become a champion weightlifter.
"My advice to other young teenagers is to begin the journey in any sport, as everyone has the power to succeed.”
He said that he planned to continue competing in power-lifting and hoped to break both national and world records.
Claire Creek, assistant principal, said: "We are hoping to make a live link to the competition during lessons. However, if his father cannot do this he has said that he will video the event so that this can be shown to the school when he returns.
"We are incredibly proud of everything Joshua has achieved and how he conducts himself as a young man. It is such an amazing achievement to get this far and the whole school is behind him as he takes part in this major competition."