You'll get 1 CP per fit player so I'd spend it all on the players you want to. I've assumed 5 CP per game (and not assumiong I get passed the next round of the cups) and now 22 CP per session and have planned who I want to use it on. If I get more than the 5 CP then I'll look for other players to use it on. I'm hoping the squad is big enough to cope with injuries, especially as I'm maximising SBY and APP use for now.
 

Just to add the 1 CP per fit player means you know you'll get some even if you lose all your games so will have CP to use on injured players if you need.

I'm glad you asked the question, Craig...no, but seriously...

As you can only carry over 15 CP per session, I have never seen much motivation to retain a large amount of CP each session.  There are times when I only have enough CP to coach two players and the "left over" amount is not worth spending on FIT, and in those situations I might have a carry over of 5+ CP. 

Personally I try and max out my CP usage each and every session when feasible.

And one thing to note regarding the FIT CP you receive for aged players each session: the CP is tallied after all matches.  Therefore, if you have a healthy player starting the session who then gets injured to a level below -2, he will not count toward the FIT CP you receive that session.

I try to keep a deep enough roster so I don't have to spend CP on players who get injured. Not as easy in the first season but after the first round or two spending CP on fitness levels is not a good return on your investment, especially if you are clever with squad rotation.

My rule is, if I have enough CP left over to spend on a player I want to spend CP on, I'll train him up. Some sessions I could carry over 9 CP, but a) it's under 15 and b) that CP may allow you to train up a player you would not have been able to in the next round.

"Therefore, if you have a healthy player starting the session who then gets injured to a level below -2, he will not count toward the FIT CP you receive that session."

Thanks for that, Brian. I was going to ask.

A thought to provide contrast with John's...

Sometimes spending CP on Fit is a good idea.  Early in a season if you invest in Fit, it will likely come out to your advantage.  An example to clarify:

During session 1, you have the option of raising the SL on a player from 10 to 11.  You have a Coach BRB, so it will cost you 10 CP to do so.  However, you instead spend the CP on Fitness for players in your T11 lineup.  3 Age 1 (3 CP), 2 Age II (4 CP), and 1 Age III (3 CP) for the same 10 CP.  Now in next session's games (if they all stay healthy) instead of adding just 1 SL to the area total for your team, you have added 10 SL because Fitness is added to the SL in determining area totals.  Assuming 2 matches per session for these 6 players, you are adding 12 SL to your area totals per session instead of just 2.  Depending on where the Fit were invested, that is up to a 10-scoring chance swing per game (chances generated by the Fw/Mf or scoring chances prevented from happening by the Df/Mf), or an extra 2-4% of Sweeper power or 2.25-4.5% Gk stopping power on EVERY scoring chance for the rest of the season.  That can easily be the difference in a win or two that might have otherwise been a draw or loss.  If it turns out that way, you just recouped your 10 CP investment to spend on the SL anyway AND advanced in a Cup or got some league points that you would have otherwise missed out on.

For those worried about injuries nullifying your investment, if your Gk or top Fw got injured, you're probably going to spend the CP on Fitness to get him back up more quickly.  Why not spend them in advance?  On average, an injury is going to produce a 2 Fitness point loss.  Instead of having to sit the player for a session at Fit -2 to get the rest point and a CP'd Fit point, if he had been Fit 2 when injured he only drops to Fit 0 and he can still play without needing to sit and without any SL penalty.  In the mean time, you already were getting the benefit of the extra Fit adding to area totals before his injury.  If you spend them up front, you get to use them while healthy AND as insurance against most injuries.  If you wait until after the key player is injured, you get only half that value.

Admittedly, SL will carry over into next season while FIT won't.  At the end of each season Fitness resets to 0 for all age I and older players and to 2 for all Sby/App players.  For this reason, you do not want to massively overspend on Fit while ignoring SL, and you do not want to waste CP on raising Fit for players that won't play at least twice every session when healthy.  A good earmark is the 10-20 CP range per season until you figure out a better pattern for your particular team and style of play.

Other thoughts: age I players are a great investment if T11 players.  Just 1 CP is completely worth it to get another 18 games out of a player at a higher production level.  Age II players in key positions (Gk, top Fw, top Df) are also wise choices so those players can get the +1 Fit in the first two sessions without having to sit.  For age III and above, the return is not as great (you can give +1 Fit to three age I players or just 1 age III player).  Plan on resting those players for a session out of the first three to get the Fit, which is a lot easier to do in future years when you have the depth to pull it off without asking for a winless session.

Whether to spend the CP on Fitness or SL is a key point of team development and match strategy.  Whatever you choose to do, stick with the plan to see how it works and don't flip-flop back and forth.  Once you've done it a full season or two you'll have a good idea of the end result and know whether your plan is working well.  If not, then try another option to see if you fare better.

What Kevin said. In session 1 I spend 19 CP on FIT. I'm not sure what it was in session 2 but it was similar. Rather than adding 4 SL I added something like 20 FIT. For this season I don't think it's worth spending too much CP on players.

Great stuff people, very interesting reading - thanks.

I spent a CP on FIT for my sweeper who got knobbled to -5 FIT (the session he got injured), I'm asuming that was lost...or would the injury have been -6 FIT?

YES, some free strategy advice from Kevin I can put to use!  Woo Hoo!  :-)

I try to maximize CP on SL for players who I want to be "stars", players that need the SL to stay alive (ensuring that I don't lose players to retirement unnecessarily), and getting as many players to FIT +2 as possible. It's a tough balancing act for me specifically... Like Steve (and Kevin I'm sure!), I like to plan my CP out for the entire season in MSWL. In United, you can't do that. So, what I do is identify who the "stars" and "keep alive" players are and make sure that I have a balance approach to get them the CP they need. I then use the 'left over' CP for FIT and for rotation players - deciding week-by-week who's going to get the CPs.

You people have to much time to consider all this.

I really really need to read the manual.....thanks for this update ;-)

Just to note, that was a relatively short entry from Dr Kevin Martin.

@Brian, please tell me you are making a joke... I hope he will never sent me an e-mail than. I might stop reading after an half hour ;-)

Anyone have an answer to my earlier question? ;)

@Craig

The report says 5 fitness lost and he was on +1 FIT that session and he lost one for playing 3 games. I see he was CPed for SL. Are you sure you FIT him as well?

Haha! Just realised what I did :)

I spent a CP on FIT to counter the one he was going to lose for playing 3 games....

Is that possible? Using a CP on FIT to counter losing 1 for playing 3 games. Didn't realise you could do that.

Yes, you can spend CP on FIT for a player during any session, even if that includes a session where the player will lose FIT for playing too many matches (i.e. 3+ for a non-GK or 4+ for a GK).

In simpler terms...

Using CP on FIT will always give you a +1 to FIT.

Player a field player 3 games (4 for GK) in 1 session will always result in a -1 to FIT.

Combine the two, and it's a net gain of 0.