Repeats are how you turn a few steps into an interval set.
If you can say "do this a few times," you can probably write it with a repeat block.
6 x
1 min Hard
1 min Easy
4 x [
800m Tempo
400m Easy
]
6 x 1 min Threshold, 100m Easy
All three examples create repeat blocks. Use the version that feels clearest to you.