Make sure you land heel to toe, and check your shoes. Find a running store and have a shoe fitted for your foot. Knee problems can occur, if you're flat footed wearing shoes with a high arch, vice...
The tricep is also part of the arm, takes up the majority of the arm roughly 2/3rd's
For me, my arms get plenty of work pushing and pulling without isolating the triceps and biceps
How does Crossramp= 10 and Resistance= 8 feel?
Can you have a conversation while performing this type of HIIT?
Anything over 10 minutes is not true HIIT IMO.
The only exercises i may do 2 sets per, are direct bicep and tricep work. Reason is, i get plenty of bicep and tricep work, when doing chest, shoulders, and back