@Nitwit.....
Fantastic that is....i dnt see any issues with ur weight....i agree may be u need work on ur Endurance, Stamina and Strength.....may be u hv nt used it for a long time that is why is not responding to the level u want it....u must be wondering why am saying no issue with weights...if u keep looking at ur BMI ie. 27 as u mentioned....i personally feel u shd nt give too much imp to it....let me tell u why....acc to BMI i am Overweight....i can really put that word overweight on shame.....just to give one simple example....i can cycle non-stop for 5 hours covering 100 kms....or can do Half Marathon under 2 hours....can just go on and on....
Best way to check is u need to record what u r doing [Log book] that speaks about the progress....couple of things u can add to build ur Endurance....
Will just give u one very simple example.....
* Skipping.....Tmrw/today just give it a try [this one of the wonderful tool....most of them under rate it...]....what i want u to try is this....with or without rope, with 30 secs break in between [totally 3 breaks] count the no of skipping u can do....[maintain a record of time taken, total nos, date, wt time of the day u did it]......pls share this then i will tell u what next and how to proceed further....!!!