Jessica Ennis... making progress after long lay-off.

Olympic champion Jessica Ennis-Hill has announced she is available for selection for the World Championships in Beijing.

Posting on her Instagram account, the heptathlete confirmed she was putting herself forward for what will be a first major tournament since her return to competition after the birth of her son, Reggie.

The 29-year-old wrote on her Instagram account: “My coach and I have made the decision that I’m going to make myself available for selection for the World Championships.”

Ennis-Hill’s decision is not unexpected and comes three days after she produced her best three performances since London 2012 at the Anniversary Games.

She recorded a long jump of 6.37 metres and a 23.49 seconds in the 200m to go with the 12.79 seconds she ran over the 100m hurdles on Friday.

Speaking after that she said her performances had made her “a lot more positive” about her pro-spects for China, having only returned to competition on May.

But the Sheffield athlete maintained she would only travel to China if she felt she could challenge for a medal.

“I am making progress and my times are coming down. I’m really happy with this weekend,” Ennis-Hill said on Sunday.

“I definitely feel a lot more positive. I feel the training I’ve done over the past few weeks has made a big difference.

“It’s an amazing atmosphere here, the track’s amazing, but that’s going to be the case in Beijing as well so I feel happy I’ve been able to raise my standards in this environment.

“I need to sit down with Toni (Minichiello). He’ll probably go, ‘No, no’, or ‘Yes, yes’. He’s kind of been up and down, it’s going to be an interesting conversation.”

Ennis-Hill concedes that she is at the back end of her career and that defending her Olympic title in Brazil next year is her overall goal.

“I’m towards the end of my career. I’ve had an amazing career already and achieved so much.

“So, Rio is the main thing for me and I want that to go the right way,” she said.