Do you have more pictures that would show side views as well? IMO adding the ice cream and biscuits isn't helping anything. Generally even if the brand is a good brand they don't digest it as well as kibble.. (or raw) IMO your giving him way too many treats, if your going to continue to do so i would cut it back to maybe 1 or 2 "ice creams" a week and no more than 2 biscuits a day.. which even then, imo is a good bit of treats.
As for the heat you'll need to work your schedule around it, have the exercising and work outs in the early AM and later PM while keeping the mid day for only as needed, short routine stuff.
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"If think you can't, you're right. If think you can, you're right." - Hatton