int heal[MAXPLAYERS+1] = 100;

public OnMapStart()
{
    HookEvent("map_transition", hTransition)
    CreateTimer(5.0, SetHealth, _, TIMER_FLAG_NO_MAPCHANGE)
}

public Action:hTransition(Handle:event, const String:s_Name[], bool:b_DontBroadcast)
{
    for(int i = 1; i <= MaxClients; ++i)
    {
        new Health = GetClientHealth(i)
        heal[i] = Health;
    }
}

public Action SetHealth(Handle timer, any fuck)
{
    for(int i = 1; i <= MaxClients; ++i)
    {
        if(bIsSurvivor(i))
        {
            SetEntityHealth(heal[i], i);
        }
    }
}

stock bool bIsSurvivor(int client)
{
    return client > 0 && client <= MaxClients && IsClientInGame(client) && GetClientTeam(client) == 2 && !IsClientInKickQueue(client) && IsPlayerAlive(client);
}