Children's physical development is being "stifled" by health and safety as teachers are too scared to let them play outside, Ofsted has warned.

Nursery bosses have "undue concerns" about letting children run around and this is hindering their ability to build up muscular strength and dexterity, according to the education watchdog’s annual report.

Playing on climbing frames, having cooking lessons and going on trips are now regarded by early years providers as activities which are too risky as youngsters might get hurt in the process.

Amanda Spielman, the chief inspector of schools, said there is a “great deal of concern” among teachers about children injuring themselves. Speaking at the launch of the annual report in Westminster, she said that nurseries must understand that “lumps and bumps” are part of childhood.

She added: "It is very important that children can develop physically, explore, do all the things they need to do to test their physical boundaries."

Without taking risks, children’s "natural inquisitiveness" is stifled, Ofsted’s annual report said, explaining: “In the early years, a crucial part of preparing children for school is developing their muscular strength and dexterity.

"But we also know that in other settings this good practice is stifled by undue concerns about the risk and safety of such activities.