For any of you guys that think you have the Pushups on lock but not the Pullups, try this:
Set a timer, watch a clock or whatever so you can EMOM (i.e. - do a new round at the start of every minute; your rest is the time between when you finish a round and the start of the next minute).
Do 5 Pullups, then immediately drop down & do 10 Pushups. Repeat EMOM x 10 minutes to get the desired numbers.
If you can't do 5 Pullups for 10 rounds, do them for as many rounds as you can, then drop to 4 per round, 3 per round, or whatever you can do.
If you can't do 5 Pullups at all, start with 4 Pullups per round, or 3 per round, or 2 round. Even if you can only do 1 per round.
If you can't do any Pullups at all, have a stool or step so you can step on it to get your chin over the bar, then lower yourself slowly for a count of 5. Then immediately drop down & do your 10 Pushups.
If you can't maintain the 10 Pushups every round, drop to 9 or 8 or whatever you have to do.
Repeat this for the aforementioned 10 rounds.
Do this at least M/W/F, if not M/T/Th/F. When you get in better shape, you can bump up to Mon-Fri.
As you get in better shape, start adding reps when you can.
If you can't do any Pullups in the beginning, you'll eventually be able to get 1 rep on your first set, then do negatives on the rest. Then you'll be able to do 1 rep on your first two sets...then your first three, then four sets...until you're doing 1 rep on all ten sets.
Then do 2 Pullups on your first set, then 1 on all the rest. Then 2 Pullups on your first two sets, then 1 on all the rest.
You get the idea.
Rinse & repeat and you'll be at the full 100 Pushups & 50 Pullups quicker than you think.