the iaaf has introduced new measures to stop women with naturally high levels of testosterone gainingmpion caster semenya is among those likely to be affected, as alex capstick reports. the dominant figure in women's middle—distance running. the only big old world —— building our lose some pussycats raised questions over her gender and whether she has an unfair advantage. it's a controversy which the world of athletics has been grappling with ever since she emerged as a global champion in 2009. rules to limit the amount of natural testosterone in female athletes which was suspended in 2015 have been reintroduced, but this time with a focus on specific events. like the 800 and 5000 meters. those who produce elevated levels will be given the option of taking medication. enabling them to compete. the alternative think lewd switching disciplines or racing against men. the implication of that as far as work goes is that testosterone increases muscle mass, muscle strength come up our, explosiveness, hemoglobin. all of those are characteristics of qualities that elite athletes benefit from.

testosterone gives many benefits which athletes benefit from and the odd men being made from the iaafs an unfair advantage as a result of these elevated testosterone levels which challenges the noble boundary between men and women “— the noble boundary between men and women —— and the argument being made. caster semenya has responded, typically defiant, she said this on twitter. meanwhile the governing anc party in south africa has accused the sport was much authorities of targeting caster semenya and infringing her human rights —— the sport's authorities. any sports person at the top of their game has some sort of feature that makes them good, michael phelps as flexible ankles and no one is telling him to take edit —— take medication. and no one is telling him to take edit -- take medication. this is a good thing, it puts the athletes on the same level. she was declared a female when she was born so why do she have to take anything which will lower her testosterone levels? the iaaf say their motive is only to create a level playing field but she will be surprised if more buts lay ahe

we'll have more on new rules from the iaaf.cided — england will begin against south africa at the oval on may 30th. lord's will host the final and the semi—finals will be played old trafford and edgbaston. but london stadium will not have any games. it was being considered with a drop—in pitch but it was deemed too much of a risk and potentially to expensive. all the details on the bbc sport website. its been a busy day for britain's heavyweight boxers — lots of them making the headlines with big fights on the horizon. lets start with the possibility of a huge unification fight between anthonyjoshua and the american deontay wilder — who holds the only one of the four main beltsjoshua doesn't in the heavyweight division. wilder has offered joshua $50 million if he takes the fight — and today issued this challenge. anthony, tell your man eddie, and barry hearn, tell them to check your e—mail, i've got something special for you. by the way, all the money's in the bag, so i expect you to be a man of your word. 0ur reporter ade aded

reporter matt what the iaaf have done is reagent used a lot that they first brought in in 2011.her she had had to undergo about whether she had had to undergo a gender verification tests and her levels of testosterone. so the rule in 2011 words per day limit on the amount of naturally produced testosterone and female athletes across the board. i was challenged in 2015 by an indian sprinter. it was successful and the court for the sport said to the iaaf goalie we are suspending a ruling combat with scientific evidence which shows is that they do get an unfair advantage. the evidence was produced last year. and now the iaaf has said we are only going to focus on women, female athletes who compete in the middle distance events. so 400 meters, 1500 meters, 800 meters which is of course where she has won all of her global championships. from now on, orfrom novemberi should say, athletes who are considered to be in this bracket will be tested if the levels are too high they will be offered the chance that will be offered medication to bring those levels down. if they are choosing not

we had over 60% of their battles one in the iaaf world championships by commonwealth athletes.rformance. please welcome to the gold coast there are royal highness is...m please welcome to the gold coast there are royal highness is... it is likely but not guarantee that prince charles will be the next head of the commonwealth. he came with a message from the queen for the four and half thousand athletes. the ancient stories told by the indigenous people of australia remind us that even though we may be half a world away, we are all connected. 0ver even though we may be half a world away, we are all connected. over the years of these friendly games have shown the potential of the commonwealth. for the next 11 days it will be up to these athletes to help prove these games really do matter. as we have heard day one of the action starts injust as we have heard day one of the action starts in just over an hour's time. let's have a quick look at the event to watch out for. the first medals will be won in the women's triathlon, former world champion and the wales team captain goes ther

reporter: t iaaf acknowledges nsists it wants create a level playing field. laura: tonight k jong-un will cross into south korean territory, making him the first north korean leader to make the cash to do so since the -- first north korean leader to do so since the end of the korean war. he will cross the deo rcation lineet moon jae in for an historic summit. the significance of the meeting goes beyond talks of disarmament. the bbc's laura bicker has been to one south korean island to n reporte importance of this moment. the fishermen living on a forgotten frontlinei across tbody of water a few miles away is the north korean mainland. in between is a scar of division. this man farms seaweed on the northern limit line rating the countries. >> thedraw lines on this ocean and tell us not to go over. it is like being in a prison without bars. laura b.: the hazards of fishing in these waters have less to do with the weather and more to do with the climate. even with things good between north and south korea,here is a bit of tension. 8 years ago, this region bort t

the iaaf will place a limit on the mat of natural testosterone allowed in female athletes.ts. those crucial middle—distance races and the longer sprints. this could affect caster semenya, a double olympic champion. she won the middle—distance double at the commonwealth games. after her first world title in 2009, she underwent a gender test. a rule was introduced making women who produce high—level testosterone to introduced making women who produce hig h—level testosterone to ta ke hormones to suppress them. that ruling was overturned. semanya has gone on to dominate since then. the change comes in in november. athletes like caster semenya would now have to take medication to lower levels of testosterone, or in fact change event. she has talked about doing perhaps the 5000 or 10,000 metres in order to not have to undergo any sort of medical assessment. and so this is an incredibly important development for the likes of caster semenya. and it has far reaching effects beyond her as well. thank you. more throughout the morning. good morning. and now, a shocking story that some