Scaling:
KB – reduce weight if needed. You should be able to do each set of 21 with no more than one break (ideally unbroken)
Pull ups – scale to jumping pull ups
CTB – scale to jumping CTB
BMU – scale to chin over bar pull ups

Top tip:
Go pretty hard on the run; the kettlebell should be light enough not to be too taxing and you don’t need you legs on the pull ups! Expect your grip to get a little frazzled.